This is my first time using casein paint as a medium. Casein, the main protein found in milk, has been used as a binder for paints for millenia, long predating oil paint. Schmincke, a German paint manufacturer, make a special binding medium. I mixed my powder pigments with the binding medium to make casein paint. They are quite runny when water is added so care is needed when water is mixed. My iriodin blue silver pigment created pleasing effects on the breaking foam in the foreground.