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.



  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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