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Casein paint

The casein painting technique, also known as milk paint, is simple to make yourself. Besides, the paint you make using fresh casein, is shining, water-resistant and much more solid than commercial equivalents that often chip. And, it's even cheaper too. Here is a typical receipe:

You will need casein powder, a caustic agent (lime or ammonia hydrogen carbonate), dry pigments, and glass containers to prepare the paint.