CMY vs RBY colours. Who cares?
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- Опубліковано 21 кві 2019
- I just use whatever colours I have in my palette.
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I think the appeal of knowing the “true primaries” is that it allows you to buy fewer paints if on a budget since you know you can mix colours you don’t have if you need to. If you paint all the time or do it professionally then it makes sense to just invest in a wider range of paints. It’s also just good to know what colours are best for mixing what though, if you do run low on a certain colour and need to mix your own. CMY and RBY are both useful but, if limited in what you can purchase, it’s worth knowing you can make RBY from CMY. There are colours I prefer made with the RBY palette but I can make the RBY palette from CMY. I’d still ideally have both though.
You are right. Exactly why I am on this video, I'd wanted to have minimal colours. I don't want to feel the need to hoard almost every colour in the world.
Usually I prefer the CMY for more vibrant, "trendy", modern things and RBY for a more natural look...
the reason using RBY looks more natural is because you're mixing secondary colors not primary colors, and when you mix secondary colors you get brown tones (which in turn makes it look more natural) thats why the "purples" he mixed using the RBY colors look more muted, its because blue and red are secondary colors.
But RBY is mixed FROM CMY... If you have only CMY you can still have RBY... with only RBY you can never have CMY.
Red, blue, and yellow colors can be mixed from the cyan, magenta, and yellow.
I'm aware of that, but I'm talking about limited and efficient pallets. It's not that efficient to mix yello+magenta every single time I need a red :)
Yes, both Primary and CMY sets have their pros and cons.
A couple decades in advertising production had taught me RGB is unreproducible and is for a screen only. We'd go round and round with clients complaining how the proof on their computer screen didn't exactly match the final printed product. They couldnt understand why it was never going to. Huge hassle
for printing, you are correct. (I used to work at Sony)
Maybe everyone should color-calibrate their screens - but that's not cheap...
Great walk-through!
My vote: Split primary ftw.
I remember feeling cheated and defeated as a kid when I tried mixing from the RBY primary, because the purples were dull.
Then I tried CMY later and the orange hues gave me grief, but by then I understood why, but it made me kind of give up on "cerebral" color theory and just go by my gut for years. Dr. Oto Kano just turned me onto the split primary a couple of months ago and I my fascination with colors and pigments has been renewed with videos like hers and yours. Thank you.
I think you have the key between these two debates. Split primaries.
I personally prefer CMY triad, because it gives me the most vibrant colors. I can always tone the brightness down, but I can't make them more vibrant. I love the CMY in my limited travel palettes.
@Storm PooPer bruh wtf😂
@Storm PooPer simp is what you're being when you made your first post. (just trying to help understand) Have a good day everyone, and let's all hope everyone can learn to be a little less sexist after watching the trouble Cuomo is in right now for example. (giggle)
@Storm PooPer I'm not sure of your first objective, but you came across slimy. That's why the other person mentioned simp. Simp.
@Storm PooPer That's what Cuomo is saying also.
@Storm PooPer OMG, you really are clueless. New York Governor Cuomo is a sexist. He is soon to be impeached. All the rest of government is telling him to resign for his sexual harassment. Being clueless about our government and top level politics is why this country has failed. Keep giving yourself thumbs-up. It shows how narcissistic you are.
"why would you try to mix colors when you could just buy the tube,' yes teoh, continue to enable me!!!
hahaha !
I think CMY is more versatile but I dont really think it matters, nowadays people have rather large palettes of colours and have both a CMY and RBY combo.
I tihnk as long as they are split (warm-cool) that's the best answer.
This video was so helpful in clarifying things for me as a beginner. I purchased the primary set from Daniel Smith. I really enjoy discovering the range of colors I can create from the three colors (Perylene red, French ultramarine, and Hansa yellow medium) they really lend themselves well to more natural colors. I see here the C,M,Y combination makes some very nice bright colors, especially violets and purples. I get really muted and sometimes muddy purples with RBY combo I have. I now understand the differences between using the two combinations, and when to use each one, depending on what my desired outcome is. Thank you, I really needed this.
Teoh: CYM or RYB. Which one is better?
Also Teoh: It doesn't matter, you can buy all of them.
yes, for beginners to learn their colors need to, in my opinion, start with CYM palette. I think it trains the eyes to see color possibilities.
I like CMY because it mix purple more vibrant.. But when doing urban sketch, my palette is more depend on RBY 😅
This is why all high quality photo printers these days have eight or more cartridges of inks that are a blend of pigment and dye. Pigments are more subject to metamorization, but are more light-fast; dyes are less likely to metamorize in different lighting conditions (because they are not physical granuals, the light does not reflect differently off of the surface like pigments, which are tiny granuals of color), but are less light-fast. To achieve the largest color gamut and the best longevity of color that is most stable, photo printers print with a large set of inks that are also blended dye and pigment. Still there are gaps in the color gamut even the highest quality photo printers.
As far as watercolor goes, a small tin can usually accommodate twelve half pans or more. Why not carry both CMY and RYB colors along with convenience colors that are difficult to mix quickly and accurately (or might include interesting effects such as granulation), right?
I agree, use colours you like. Personally I prefer the CMY basics cause I lean more towards pinks and bright purples when I paint for flowers. However I make sure I have a nice mix of colour options cause you never know what colour you may need.
I agree you should use whatever colours you have available. Though I've played with a CMYK palette for funsies in the past and I loved it. I think a black is really essential in the set imo in order to be able to actually get dark colours, though. Nowadays I have both my CMYK colours and my RGB colours all in the same limited palette of 17 and it is such a wonderfully versatile palette. They're a lot easier to use in a palette with more colours and convenience mixes, instead of having to mix basic colours all the time which can be a bit of a pain like you said. I definitely agree with you there :)
I have found Pthlalo Blue far too strong for a cyan for my liking. It took a long time searching but I managed to find a colour from a local paint maker called Wallace Seymor, who makes a blue called Cobalt Turquoise Light Genuine using Pb36. A close alternative would be cobalt teal from other brands but they are all a little too yellow leaning and I have yet to find a matching alternative.
My personal favourite colours for a CMYK palette are bismuth vanadate lemon yellow and opera rose from Daniel Smith, Cobalt Turquoise light genuine by Wallace Seymor plus ivory black or mars black from Winsor and Newton Professional.
Thanks for sharing 😁
I don't keep a black in my palette... although I do love using bloodstone which is quite dark, or mixing a deep color for black.
Great video! I use CMYK at work but have never thought about it for painting. Thank you.
I love how you "" with your hands when you said true magenta. Thank you for making this video, clever video name. Like you said, use the colours you have and love, and experiment. Great advice!
Ever since I got back to using watercolors, I have just used the split primary palette. It's just 6 colors plus quin burnt orange; because, I don't have burnt sienna. It has worked well for me all these years.
There is no primary ink colour for blue its mix of Magenta + Cyan and as for red (Magenta + Yellow) will create these colors. Unfortunately we are being thought from an early age to use RBY when it should be CMY to mix ink/paint. Its the mistake people make when they use the primary blue and red from light and translate it to ink. Subtractive colour mixing (ink CMYK) and additive colour mixing (light RGB) are 2 complete different systems. There are no tv's running on CMYK and there is no printing company that prints in RGB :-).
CMY because you can mix a warm blue and a warm red and mix all the colors you want in those general color families. Obviously you can’t mix specific watercolors like an ultramarine or a pyrrol scarlet, but you can mix a vibrant warm blue and a warm red, while if you choose RBY you can’t even mix a vibrant purple or a vibrant green. CMY gives you more variety in a limited set.
My personal color palette uses both systems with the addition of burnt umber, raw sienna, and titanium white. I find that their strengths and weaknesses cover for each other nicely, and I don’t have to buy a bunch of other niche colors because I can always get something very close
Great video Teoh! I always wondered if that theory applied to watercolors too. Now I know! Both are good color palettes in my opinion. Looks like I might need to explore them more! Ohhh seeing your limited palette sketchbook is inspiring me to make my own! Lol 😂
I definitely prefer granulating colors, but I do like having the split palette option, so I can mix anything I want. (although I have a ton of convenience colors anyway, and some I won't give up!) Thanks for this video!
I don't have Quinacridone Lilac, but I did really like the mixes you got from this it, so I think I'll add that to the list. The CMY palette you created does look good if you're building a tiny travel palette.
BMY 😎 magenta is the true primary color for red... pthalo blue greenshade, quinacridone crimson, Indian yellow, titanium white can make any color except neon secondarys
Adding titanium white to a watercolor painting, Heresy! Just joking, great comment.
Quin crimson? For watercolor? I use quin rose, basically pv19 is the best pigment for that “magenta/pinky red” color for me.
@@theonlyjoshuscat I use acrylic to clarify :) liquitex softbody
Wildboy789789 that makes so much more sense!! Thank you for clarifying! 🤗
Thank you for this Teoh! I've been struggling lately with colour and I had to go back to the basic colour theory lessons. The video helped a lot.
It could be my iPhone screen but Thalo Blue seems a lot more blue than cyan which is closer to cobalt teal. Personally I use a split primary set of six rather than just three. Great video though. Thank you.
I really enjoyed this video!! So informative and entertaining to watch.
in general i tend to use the cmy but, you have to choose the right magenta. i tend to prefer permanent rose because lilac is tooo cold. there are some permanent roses that are made with PR122 and i think those were the ones that were being recomended to you. It's not possible to create every single colour with either system, specially if you want to have granulation, but that's why most people won't use only cmy or rby. i'd choose cmy and then add my favourite granulating colours along with either an orange or warm red.
Rose madder is also a good color to use.
@@Toastcat890 the thing with rose madder is that the genuine pigment is way more expensive than these options and very fugitive. But it is soooo beautiful 😍
A good demonstration of why a split primary system might give the easiest and widest wide gamut if you need to limit your palette size. Or RYB primaries with secondaries, which can also work well. (I gotta have a diox purple, personally.) I dislike the muddy secondaries you get if you limit yourself to any three primaries - at least one of the secondaries will be dull.
I love your limited color palette vids! Great tip to let people know they need to experiment to find out what colors work for them :)
I wholeheartedly agree with this.
Very interesting indeed. Thank you again Teoh.
This was really informative. Thanks for this video!
If the widest possible color gamut is the goal then CMY based palette is the way to go. However limited to just 3 primaries the CMY palette is actually lacking as well. The complete CMY based palette actually contains paint colors such as Ultramarine blue and Pyrrol Scarlet. When limiting a palette out of necessity to only 3 colors it makes more sense to select CMY triad because of its versatility but again, even it has its limitations when cut down to just 3 colors.
I think if you used a true cyan and magenta instead of blue and dark magenta, you would actually get more vibrant and true to colour palette
Depends if I need to design a printer with the widest possible gamut, or if I just want to paint. :-)
@Yasmine S. I was being facetious.
Just "found" you courtesy of UA-cam algorithms. Thanks ever so much for the informative video and sharing your considerable talent with the world.
He has such an ASMR voice. Very soothing
Thank you so much for a good overview.
I paint in oils rather than watercolours, but I like a cross between the two triads. Cad Yellow Light, Quin Rose (PV16), and French Ultramarine. Add in a Burnt Sienna and its pretty perfect. I would use these colours for watercolour painting as well.
I have been doing experiments like this, I think I will follow along with this video and do this experiment myself as well. It's very useful for learning as long as we don't get attached to one way being right or wrong!
This is great, would love to see more colour theory stuff!
Search Teoh's channel, he has done a lot already. I always enjoy more too :D
I prefer cmy because I'm picky about my reds. I use a medium yellow though like py154 so there isn't a green or red bias.
I knew about this combination for printing, but I never thought about it for painting. I did the experiment and found that I really liked the flexibility of this combination, especially the magenta vs a more traditional red. I tend to like having 'all the colors' and exercises like this help me think about using the restrictions of fewer colors in a new way. Thanks!
I would even try a blue color that leans more to cyan.
I agree, I like RBY triads for landscapes and urban sketching for the most part, and only use CMY for brighter effects. In my opinion, CMY triads produce colors that are often much brighter than reality which works well for illustration, florals and many painting styles, but doesn't necessarily represent the real world. I love to play with bright (CMY), mid-tone (RBY) and earthy triads for different uses.
One quibble with the printing info: CMY/CMYK is not layered like watercolor, the colors are mixed out of dot patterns of the 3 or 4 colors. CMYK on-demand printers like ink jet and dye-sublimation are dots only. However, in traditional commercial printing yellow is sometimes printed third and black printed last and can be layered over the other colors depending on the print options, for example text heavy solutions may have a solid black to make the text easier to read.
other painting videos I've watched have described it as being in colour universes and knowing that one set you can paint x amount of colours while in another you have y amount. cmy comes up a lot in gouache because of its history of being focused towards designers and requiring colours that can be reproduced with a printer.
i wish i could just go out and buy premixed colours when i need them, but im not a famous youtube painter :c ;)
Just do both and get a more neutral yellow and split primaries for R+B. For a super limited pallette I think Ultramarine + a cool red give a more natural look and are easier to mix than super saturated colors, but without Phthalo you won't be getting very saturated greens or light blues.
i think really when this debate comes up you hit the best answer. split primaries and add a magenta.
I don't have a favourite primary colour combination, I like to experiment but the CMY one it's pretty vibrant. Thanks for this video :)
since my favourite red is carmine, it doesn't feel like I'm missing out on magenta. and I would argue that in history, there were less words for colours, so magenta would possibly have been called red anyway.
The smallest palette that I have is a 12 color range, it has both CMY and RBY plus a few convenience colors like a teal, payne's grey and a Buff Titanium. It makes for some very interesting color combos when I don't feel like bringing out my giant palette.
CMY for me is the simplest and most versatile (if you only can have 3 tubes.) But a split palette of six, warm and cool primaries is the most versatile. The warm can use Raw Sienna or Indian Yellow or Ochre , Add in an earth color (transparent red oxide) or burnt sienna and you can make almost anything. I generally have no use for tube greens.
I really like the CMY system, but really it boils down to if you'd rather have a warm or cool palette.
hence the split palate argument. haha.
I prefer both but i mostly reach out for cmy colors prob because of the coloring style i use, but all in all, both are very beautiful color palettes
😍 thank you
Interesting. Thank you!
Im actually just starting in watercolors but I did make a primaries only palette because I need to learn color mixing. As for which to choose I don’t see a problem unless one color prevented another color from being mixed then in that case at least for me id pick a different shade or with some different properties depending on how it was preventing me from mixing a color I want.
I'd like to learn CMY, it seems like an interesting way of mixing. I don't learn it though because the colours I use are usually complex browns. I would imagine that newer artists will learn CMY over RBY but RBY will remain the standard for mixing for a long time to come because the natural tones that come from it are much easier to achieve.
For the CMY I like to use Quinacridone PV42
I guess it's Magenta from Schmincke, isn't it? I use that one, too.
Great video
I was taught in school that RGB are the primaries and it frustrated me for years. Now that I know, I can't believe this misinformation is spread so much.
It's science, so why is there even a debate?
That being said, I see why a landscape artist doesn't want quin magenta or the staining phthalo blue on their palette.
There's also a certain harmony that using a triad that isn't CMY can bring to your paintings.
I think we should know the true primaries, but not be afraid to experiment with other colors.
lol RGB
Ramo They are the Primaries... in Additive Color Theory, or the colors that we see with our eyes through light or on our computer screen. The rods and cones in our eyes are proof of that.
The primaries you’re thinking of are of SUBTRACTIVE Color Theory (CMY), or the colors that are gotten through pigment.
So no, it’s not misinformation, but a different sort of color theory that is true in the natural world, but impossible with pigment or physical mediums.
Thanks for the video. Where does cobalt blue fit in?
It's a good blue. I would say it's "between" Phthalo Blue and Ultramarine.
phthalo blue awww- Bob Ross anyone?
awww
I have both cool and warm primaries on my palette, because they both have their strengths and weaknesses and honestly makes it more versatile. I think you mentioned that in a video about making your palette more versatile and you basically said to add more primaries lol
Do you mean you use both palettes, or some specific colors in both warm and cold tone? What are those specific colors if there's more than just three?
Sorry if questions are stupid, just trying to figure it out.
8:43 CMY was a game changer for me learning to reproduce the colours I see not the colours I think I see! I definitely recommend trying them for a few months, you might be surprised at what it teaches about colours. I think RYB is better suited to landscapes though, everything natural is really a tertiary anyway.
Lemon yellow for me is like yellow + a tiny little drop of blue. I'd rather choose some pure strong cold yellow for CYM so I can have a nice red along with nice purples.
Just my thought. Lemon Yellow is to cold for the warm color combo as well...I also use CYM but have split up the yellows...a cool and a warm one on the top wheel...works just well
I learned, doing acrylic, that there are actually 2 of each primary colours you need, because 3 will make warm colours, other 3 will make cold colours. Can't remember them at the top of my head
Ohhhh.... please recall them and tell me. I'm researching the way color is percieved for all different reasons and what you said is, probably, closer to the truth, than just a 3-primary color palette.
@@ronanrox I did. These are the pigment names (if your pigment color say hue, it is not a pure color, it is made to look like that color). Cold colors first:
Blues; PB 29 and PB35
Red; PV19 and PR108
Yellow; PY35 and PY3
New painter here. I've looked at most of the student grades paints in the US. VanGoh, Academy, Cotman and big box house brands. I don't see paints just labeled as CMYK or RYB. It sure would be easier.
I don't think that CMY works so well for landscapes. The greens to me look quite artificial. Though, I have some of what you might consider both. I guess what would be the double primary system (warm/cool primaries). Thanks for your video, I have wondered re: the assertion you could mix any color with CMY. I suppose if the colors were actually CMY--hard to do this with paint.
Yes, but you can tone down the green with a little tiny bit of red! (or magenta+yellow)
Many people just add black to the greens.
I am a beginner to watercolor and i am thinking of buying winsor and newton cotman watercolor but i only want the primarys cold and warm can anyone tell me what those 6 colors are
i thing cmy has a leg up. if you think about it you have yellow, magenta and yellow become red, and cyan and magenta become blue. RYB gamut is largely included in cmy.
The py175 is not a middle yellow. It leans a little towards the green.
Yeoh : *makes video about cmy*
Also Yeoh : *uses yellow, pink and blue*
I usually have the six of them in my palette
I really like your videos.
Thanks 😁
I think it's worth just using your store-bought red and blue, but for mixing greens and purples, you will get much more vibrant hues with cmy.
It never made sense to me why art and printing had different primary colors. I always wondered why there were no cartridges for blue and red. Turns out this is the awnser, CMYK is superior to RBY.
Wouldn't it be necessary to layer the CMY colors to fully get the color potential of that system, instead of mixing beforehand? Thanks
no. Not necessarily. But glazing is definitely a tried and true method for watercolor, no matter the palette used.
There's an artist who does this and her pieces are spectacular
Split primary is the best option for me
What brown and black might you add to these? Those are hard colors to mix.
Teoh mixes brown constantly, if you don't want to mix I'd think pick the color you are most trying to use
For black, I usually go with French Ultramarine and Burnt Sienna for fast mixes. Cerulean Blue Chromium and Burnt Sienna for lighter grey. Otherwise, it will be a mix of primary colours that I already use in my sketch. For browns, usually a mix of three primary colours. Really depends. Sometimes I may start with Burnt Sienna too.
😕 I like all colors but my favorite is orange, green, violet/purple. It hits.
Is this a naming for colors for artists? CMYK VS RGB in Photoshop is the more precise nomenclature. CMYK is usually used by printer companies I believe.
RGB is an additive model for light - computer monitors use light. Computer printers use inks and the subtractive model CMYK.
Adobe and have a slightly different system for converting RGB to CMYK for printing than other computer programs, have a look into Adobe Colour Space and sRGB if you want to learn more about computers marrying the two.
Pigments in physical paints are not perfect.
I learned painting using RBY, but personally I think it doesn't matter. If you need something more vibrant, use CMY. Both palettes are good and versatile, depends on what you need.
QUESTION: so if you want to make prints that reproduce true to your original, should you use the CMY ?
Actually it doesn't matter what colour you use. Scanners nowadays can scan very accurately. When you print, it's going to be fine.
@@teohyc thanks Teoh
In my opinion when I do cool Colors paintings coy does bettter and ryb is good for warm colors
I am intrested in getting to know wich colours would print well. Lemon yellow prints mustard in my experience
Hansa Yellow Medium, Azo Yellow should be safe
@@teohyc I will try them, thank you ! I am doing a watercolour illustrated vook and I was very desapointed when I saw the print. The greens espacially, winsor green, viridian, didnt print at all. They are very dark !
It's why I have doubts using the CMY pallete as my main palette as it would be a chore to mix blue and red, and mixing bright oranges can be a problem. And since the palette is based on printer inks, and printers use black, black is the least thing I want to not to avoid, but to be careful of.
On the other hand, if I overrely on the RYB palette, it would feel too limited in some cases. You'll never know if you'll need a bright purple or an intense pink if the subject demands it.
It's why split primaries became a compromise to both palettes.
I care. I care alot. I care so much. I care *way* too much
sounds like a type "A" (because me too...)
Oh i forgot to ask, what did you think of that magenta color?
Interesting, I didn’t know some watercolours have a different texture. Although you can mix any colour with a true CMY palette, I see why you'd prefer to have a wider variety in watercolour for the effect. The limited colour palette would probably work better with acrylic and oil paints as I haven’t noticed different textures in my little acrylic sets. Someone with better paints may correct me, though. That's also the reason I'd prefer to mix colours, I don’t have the money or space to collect every colour separately.
I am going to paint casually and I will only buy cyan, magenta, yellow, black, and white paint.
Buying 4 shades of blue and 6 shades of orange is such a waste of time and money and I don't know why everyone does it
For painting, I prefer the RBY combination. I find your magenta looks more pink than lilac which I see as more purple. Also, you can just mix red and blue to make magenta. I like combining colors because I can only spend a certain amount on different colors. Besides, mixing your own colors is a great way to learn color theory.
You can’t mix red and blue to make magenta
I tried CMY from my palette and wasn´t able to get real black. That´s why I understood, that in printers are 4 colours - cyan, magenta, yellow and black. I used yellow (PY 14), not lemon yellow. Oranges and reds waren´t so vibrant, but I got beautiful blues, natural greens and browns. Yes, not granulating, but is there outside in the sky any granulation? Maybe in the future I´ll change my mind, but today I prefere colours, that mix well without separating. I am going to test PY 150 instead PY 14 and I´ll see. Thank you for your useful videos. Have a nice day
You need the right CMY to mix black. Printers use K because that's the best way to print black. Using CMY to print text may result in the individual colours separating, resulting in colourful looking text.
@@teohyc Thanks for your answer. I know. I tried my best with my Mungyo watercolors (C - PB15:3, M - PR81, Y - PY14). I obtained some dark greens, grays etc., but not pure ink black. Printers use black also as an economical solution, instead mixing black from 3 cartridges.
What do you mean by granulated and non- granulated ?
Granulation has textures caused by physical particles of the paint.
What a weird name for PR122. PR122 is usually Quinacridone Magenta, given the composition of the pigment.
It's my favourite magenta and my go to cool red.
About granulation, it is not impossible to achieve with non granulating colours. You can buy a special liquid called "granulating medium" that can create wonderful granulation on any non granulating colour.
ua-cam.com/video/ea9K_Xwi9D8/v-deo.html a review of granulation spray and one for medium ua-cam.com/video/fOKqNRSk0BE/v-deo.html I might need to try them
It seems CMY would be good for florals
But Phthalo Blue is also known as Azure and Azure is in between Cyan and Blue so why does Phthalo Blue work as Cyan for you and not Sky Blue.
Firstly, that yellow is too green, unless my screen wrongly calibrated. Secondly "Blue" is not the same color it used to be. Blue was lighter closer to cyan. Why red is called primary traditionally I don't know. Magenta pigments where maybe not available or very expensive. Anyway Cyan, magenta and yellow are the primary subrtactive colours, that are the facts.
While the experiment is great, I think you should first understand what's the difference between CMY and RBY and why RBY is still here today.
The RYB system is in fact what humanity used as primary colors before the modern science solved that problem.
It is still quite useful, even if mathematically wrong.
In antique Greece, they used several color system, but one of the most well known is the four-color system :
Brown, blue, green and red. The reason : It's the 4 elements (they really liked the elements).
In the middle age, they changed it for Red, Blue and Yellow. They called them "noble colors", then in 1600 "primitive colors" and "primary colors".
They were searching the 3 colors with which you could make all the others. But at that time it was quite difficult to make pigments, and they often didn't mix well.
So the RBY is an approximation of CMY from the middle age.
Then in the early 1900 science is now a lot more advanced, they can study lights, and know how the human eye works. The RVB model, with additive color, is becoming popular, and the CIE (International Commission on Illumination) find the mathematically correct wavelengths of the 3 primary colors : Red, Blue and Green. With that, they also find the mathematically correct wavelengths of the 3 secondary colors, which are the 3 primary colors in the subtractive color model : Cyan, Magenta and Yellow.
But the mathematically correct colors have nothing to do with the colors the industry is using at that time. When the artists, painters, dyers, and printers of 1930 try to use this model, it just doesn't work. The reason is simple : Their colors are not perfect and they do not mix perfectly. If you try to mix all your paints, you won't have pure black, but a brown-purplish mess that is not even close.
A huge portion of the industry then kept the RBY color model. They even fought back, the Bauhaus (a well known designer school at that time) published books about colors to reinforce their model.
So ok, they reject the model because it doesn't work in real life application at that time. The problem is that the modernisation brings the industry closer and closer to the CMY model, witch photography, printers, digital art, etc.
Our real life colors are now way better than in 1930, but the disinformation of the art industry at that time is still widely spread.
A lot of art books will refer to well known artists and not to science, which result in wrong colors wheels still being used and published today.
Cmy ftw!
I like CMY for my style ..
Phalo is not cyan, which is why your color chart did not work properly. Cyan would fit between blue and green.
Often, Titanium white is added to primary cyan and Magenta, at least in oil and acrylics. I don't know if that's the case in water colours as well.