What's the difference between commercial paint and casein paint?

Question: What's the difference between commercial paint and casein paint!?

Can anybody give me a null and alternative hypothesis for these!?
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Best Answer - Chosen by Asker:

Casein paint, derived from milk, is a fast-drying, water-soluble medium used by artists!. It generally has a glue-like consistency, but can be thinned with water to the degree that fits a particular artist's style and desired result!. It can be used on canvas panels, illustration boards, paper, wood and masonite!. Because the dried paint film is inflexible and brittle, it should not be applied in heavy impastos on flexible supports such as canvas!. Casein paint is reworkable and can be used for underpainting!. It generally dries to a matte finish!.A quick way to make casein painting medium is to take some skim milk cottage cheese and first wash off any of the milky fluids!. The lumps of casein left behind are then dissolved by adding, in a pot, water and some ammonia!. The ammonia should be preferably in the form of ammonium carbonate!. As the mixture is stirred while it warms it begins to froth and the lumps dissolve!. Don't boil it, but just keep it simmering and stirred until the frothing stops!. Cool the syrup down and this is the medium!. It will keep in the refrigerator for about four days!.Www@QuestionHome@Com