There are four different types of pigments, inorganic, organic, natural, and synthetic. The difference between natural and synthetic pigment is that synthetic pigments are made from raw materials that weren’t already pigments. As well synthetic pigments are chemical reactions, while naturals are refined from native ores or earths and with a little help of physical and chemical treatments they are turned into pigments. An inorganic pigment would be hematite or another type of mineral and an organic pigment is one coming from a vegetable or animal. A pigment coming from an animal is Indian Yellow. It came from the urine of cows that were only fed mango leaves and water. This diet made their urine very bright but unfortunately it also ended the cows’ lives so they had to ban this color from being sold. I mentioned this pigment in one of my earlier post, if you would like to know more organic pigments you can visit that same site.
For more information on this matter try visiting: http://www.noteaccess.com/MATERIALS/ClassificationP.htm