Derived from milk, casein paint dates all the way back to Asian cave paintings. 

It was widely used up until the Renaissance, and it's durable, fast-drying, and water-soluble. It does smells a little strange, but the smell dissipates as it dries! Do not use if you are allergic to dairy products.

Ingredients: 

• Casein powder
• Borax
• Earth & Mineral Pigments

Prep time: 5 min. prep; then let sit overnight. 5 more min., and let sit an hour.

Process:

1. Mix 2 Tbsp. casein powder with 5 oz. warm water, and let sit overnight.
2. Discard the water that accumulates on the surface.
3. Mix 1 Tbsp. borax with 4 oz. hot water, and add to casein/water mixture. Let sit for one hour.
4. Mix a spoonful of the casein mix with pigment in a glass bowl or on your palette.
5. Paint on wood, paper, or canvas. Add water if you want a watercolor effect. 

Mixtures last a week if refrigerated.