It's time to make your voodoo doll. Mold it and let it dry by leaving it in the air for a few hours. Then, if you want, you can paint it. And, of course, give it a name. What else you do to this guy is, of course, up to you.
Milk solids are basically fat, minerals, and protein.
This protein, which is mostly what is left in your moldable substance, is called casein. Like all proteins, casein molecules are made up of long chains of amino acids. These molecules are very long and flexible, until they harden.