I'm working on a black ceramic vase. The blackest I can get starting with 2 parts burnt umber and 3 parts blue isn't black enough for much of the vase. My mix works fine in the lighter areas (next step). Should I use the blackest I can get and then do a half step for the next step. In the grand scheme of things, no one will know unless they see the vase and painting side-by-side. Seems I remember Mark mentioning this is the video, guess I'll have to watch it again.