Milk Paint has been around for thousands of years, with the roots as far back as 6,000 years ago when it was used for cave paintings. It is now gaining recognition as a biodegradable, green product. Milk paint is made from milk and crushed, natural pigments, and it is used for walls, furniture, and even art. It is very durable, as it hardens with age. But, beware, there are companies who market "milk paints" which are not natural and contain harmful chemicals.