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Making Red Oxide Casein Paint for New Painting

January 7, 2018

As I’m starting to work on the background of the new painting, I noticed I was too low on the red oxide paint that I wanted to use, so I needed to mix up some more.

I also wanted to test out the package of Bob’s Red Mill milk powder I bought recently to see how well it works for making a casein binder. 1 quart of rehydrated milk gave me a little less than 6 ounces of casein when I added 1/2 cup of vinegar. That’s the separated milk liquid on the right. I’m used to seeing the milk coagulate into a large ball after I add the vinegar, which I then tear it into small pieces so it will dissolve better. This milk forms small clumps of casein instead, as seen here, so that saves me an extra step.

I added about 2 teaspoons of Borax diluted in 1/2 cup distilled water to this casein, and let that sit for about 24 hours to form a thick smooth gel. This will be my paint binder.

The red oxide pigment was purchased from Camden Grey. A one pound bag cost me only $3. It makes a lovely dark red burgundy color that mixes very easily with my binder. I’m waiting on an order of empty paint tubes to arrive, so I’m using a one ounce jar in the meantime.

Here’s a scan of the paint on a piece of watercolor paper. I painted it over some black Sharpie marks to show how opaque it is. It also thins down nicely. Now I’m ready to get back to work.

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3 comments

  1. Are you added some preservation agents in the paint? Thank you.


    • Yes, I added a single drop of thymol.


      • thank you!



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