Colouring Wax Resist with Food Colouring
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- Опубліковано 27 січ 2023
- The food colouring I used for this: amzn.to/3kRGQ2B
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In my classroom I add concentrated liquid watercolor to my clear dipping glaze, so the students can better see where it is applied. I use a magenta pigment, that ends up looking a light pink when mixed in. There is absolutely no trace of the color when fired. The bottled brush in clear we use is also colored pink, so the students will associate both of them with each other, as being the clear coat.
A standing ovation for this brilliance!
At the wedge wood factory they told me they used beetroot extract to colour their transparent glaze so they could see where it had been applied in the spray booth…..
I've used oil paint to mark pots and some of the colors burn out, the others leave a little residue (phthalo blue and green leave copper oxide behind) - if you look up the chemical formula of the pigment and there are no "ceramic elements" in it, it should work out.
For example the blue used in your set is: FD&C Blue No. 1 / E133 - chemical formula C37H34N2Na2O9S3 - so you can see it only would leave a tiny amount of NaO behind. The humectant is glycerol / E422 - C3H8O3 - no residue after firing. The water and food starch, likewise, contain only CHON which will burn off.
You can do other analysis of other colors in a similar basic-chemistry way to evaluate colors before purchase, but as with anything in pottery you do eventually have to test them, even if it's in "the line of battle" so to speak on the first pot.
I don’t have information about this craft but that was genuinely shocking
FYI, I tried using the cheap, liquid (not gel) type of colour once and it reacted very badly with the wax, foamed up and went all clumpy. Do not recommend.
Very useful to know, thanks! It's things like that which make me want to do my own tests before recommending anything 😬
Thank you so much for testing the food coloring trick to make wax more visible. I've heard about this for yers but never had to try it as my wax was bright pink. Just bought bottle online and it's white and very hard to see. I'll give it try.
Is the goal of this test for adding color to wax resist that ISN'T already colored? If not, what is the use case for having such brightly colored wax resist? Is it just so the wax is SUPER visible? Especially if you've watered down the resist?
Sorry, I don't think I made it particularly clear in the video. The point is just to see if the food colouring burns out. If it does, then it can be used in a few different ways. Colouring (uncoloured) wax resist is one, but other uses would be things like visually colouring unfired glazes in different colours to see the application better, or brushing coloured water on to mark the clay temporarily (I use Sharpie for this at the moment)
@@OldForgeCreations Oh! I see! Those are great ideas! 😊
I don’t have information about this craft but that was genuinely shocking