I was reading a Swedish murder mystery and a person of interest in the book was an artist who painted her canvases all in black and then scraped back using sandpaper - and let whatever happen, happen. She created very abstracted pieces that were without color - just black and the white of the canvas when she scaped down to it. It got me thinking about painting on black paper. So I used black gesso on watercolor paper (300# Arches). When that dried completely, I began painting the crow the round glass ball, just seeing what the colors would do, if anything. I used irridescent pigments, too. I'm not crazy about it. You have to have light hitting it just right to see it well and the crow looks mostly white. I think gouache in colors would work okay with this - and I might wipe this off and try again with pigment mixed with white gouache since I don't have any gouache colors.
What do you think? It doesn't photograph well at all - the black of the paper is much darker than it's showing here and the subjects aren't this bright.