I'd heard of this. Disturbing, to say the least, but not something that will frighten me away from the word "sugar" which is the root of this thread. Bone char

I'd heard of this. Disturbing, to say the least, but not something that will frighten me away from the word "sugar" which is the root of this thread. Bone char was also used in paint, but I'm not about to decry the painters of old over it. Our modern alternatives are in place.