Chromate Pigments Part 1 (Chrome Yellow)
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- Опубліковано 29 вер 2024
- This is the beginning of a series on Chromate based pigments.
In part one I will make Lead Chromate also known as Chrome Yellow.
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If you added soluable silver to this would it make black chromate? It’s my understanding that yellow chromate + silver = black chromate
I made chrome yellow using lead acetate and potassium dichromate.
Mixed it with some titanium dioxide white pigment.
Ground it into a linseed oil based paint and painted a birdhouse with it.
I am appalled at how chromates and dichromates are treated here. This is chromium in the oxidation state +7. ALL CHROMATES/DICHROMATES ARE HIGHLY TOXIC AND ALSO CARCINOGENIC. In addition, lead nitrate is a very easily soluble salt of the very toxic heavy metal lead. I can only warn everyone that playing with such substances and using them as pigments is simply stupid. Anyone who pours the waste from this production down the drain not only risks poisoning the groundwater, but also faces severe punishment from the public prosecutor. It is stupid and irresponsible to post a video like this without pointing out the dangers.
Wonderful. I shall paint all my shutters with it. After I finish applying my wallpaper in beautiful Cupric Green.
Lets go all out and start with an undercoat of lead white.
Found out there is a new yellow compound that is replacing lead chromate. Its bismuth vanadate, a very intense yellow! You can buy vanadium pentoxide from pottery supply stores and react it with sodium carbonate to make sodium metavanadate. From there I guess a bismuth salt of some sort would do a replacement reaction and make bismuth vanadate
I am in the process of tracking down the materials I need to make the Bismuth Vanadate it looks very promising as a replacement for chrome yellow, though chrome yellow is very unique and despite its toxicity I really like it. Thank you for the information its helps a lot, there are only so many areas I can focus on in terms of research, so any help I get is very valuable.
@@TheAlchemicalArts Do you watch the channel Periodic Vidoes? The professor talks about it. The video is called "The new yellow."
I really enjoyed,thank you.
Would sodium dichromate work?
How does the reaction look like?
I don't know how the dichromate makes lead chromate and not dichromate. I was looking for the reaction in the internet but they really doesn't look normal.
dichromate mainly forms in acidic solution
Maybe better to use a paper filter with buchner funnel
So, with this pigment, is this going to brown over time? I've read that it's not lightfast.
Yes it will unfortunately but there are some improvements that can be done that will make them lightfast which I will explore in a future video.
@@TheAlchemicalArts Thank you. That's very interesting. What is a pretty good equivalent for a pigment that is lighfast that has a similar chroma? Also, the cake that you made in this photo - will that be for binding with other agents to make a paint?
The Alchemical Arts how shiny is that chrome yellow paint? Lead paint is durable even though it is toxic. How do you get other colors of lead based paints like blue,green,grey,black,purple? I know they have weird names like chrome yellow. Is it possible to take powdered lead add linseed oil to it and powder pigment make own lead paint by mixing it together?
Can i use this pigment to make crude oil paints?
Yes most pigments can be used in oils.
Yes, I tried successfully myself.
You should get a paint muller if you don't have one.
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Just don’t lick the paint.
I recently did a electro- chemical reaction with chromium eletrodes in a magnesium sulfate solution. The solution started turning yellow (which I assume is the chromate ion). So I made magnesium chromate?
I would say so, most metal chromates are yellow as far a I know. Nice accidental pigment making.
@@TheAlchemicalArts This was water soluble but i'd love to try making copper chromate, iron chromate, zinc chromate. I've got some lead weights and wanted to turn them into some water soluble compound so I can make lead chromate, what should I dissolve it in? Vinegar only seems to work on oxidized lead. I have sulfuric acid and hydrochloric on hand
@@twycross3 Oh I see, yeh cool the yellow is the chromate ion. I have dissolved lead in glacial acetic acid to make lead acetate. I usually dissolve metals in warm to slightly hot HCl in a flask with a stir bar and some way to deal with the potential HCl vapors usually takes a number of hours depending on the metal and size.
@@TheAlchemicalArts Thankfully hydrochloric acid is easy to obtain. I had a hard time finding strong sulfuric. I live in the US and I found out you can buy drain cleaner thats around 80% concentrated sulfuric acid.
@@twycross3Actually I just did some reading and HCl wont work at all with lead. I would try and get glacial acetic acid if you can or at least some sort of concentrated vinegar. I wouldn't use drain cleaner as there will most likely impurities and cleaning and purifying acids is not really that fun or safe, plus again I don't think sulfuric is the best at dissolving metallic lead.
Very nice
Also give me link of part 2 thanks
Thank you.
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Nro where is part two
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