Black and White Blanks

I put my sepia decals on the black and white and fired tonight  so I'll seal them tomorrow and refire
I really like the black look - I need to figure out a way to make my own decals or hand paint onto the ceramic and glass  so that they stay black.

Here are the black backed blanks with the decals - before firing (will turn to sepia colour when fired)

I put one of the black and white decals on one of my ceramic hearts= just to give me an idea of what it will look at  - I can fire and get sepia (which I may do just to try) but really want black and white

Working on another sheet of zentangles