I'm not really an expert on this, but I can try to help! Maybe some of the other trolls might be better at it. [She's only really had a matespritship and maybe was black on a few occasions. But it was different since she wasn't really alive either.]

Oh. Eridan is here! He could probably help with that a lot. I'm pretty sure he had a blackrom or an attempted blackrom. [Eridan and quadrants, man.]