So after fiddling around Kobold browns, deepwood greens and ink blues, I finally got soot black! ^^

I fed 2 pineapples from ink blue to get soot black, but I think the results may vary, since when it was Kobold brown the first time round I fed it only 1 plum, but it turned into Deepwood green, instead of soot black like it was speculated to. (Ended up I did alot of tinkering around with the darker colors to trial and error)