I pulled out the Artists Handbook of materials and techniques. I had a few questions about colors, remembering some conflicting information that I received about using black, particularly Ivory Black. I found some interesting information about it use. I was told by several teachers while in school not to use it, make your own black, recently it appeared on my supply list for several workshops. hesitant to use it, I did, now after being comfortable with it, knowing its not going to turn into this monster on my pallet I needed to know what its story is.... so here it goes. Ivory Black (PBk9) Paris Black An inferior grade of ivory black. " Impure carbon. the black most widely used by artists. Most ivory black on the market is a high grade bone black, made by charring bones. Contains only about 15 to 20 % carbon, and about 60% calcium phosphate, and about 20 % calcium sulfate and other impurities, some of which are water soluble. It should not be used with in fresco or for mortar o...