Is it possible to airbrush on ganche? I need black ganche. I did add black color to my ganche when I made it, but it's still not black enough. Appreciate all advice ☺️

You can if you have oil-based colors.  Wilton and Americolor are water-based and would likely bead up on the surface.

@640Cake, do you know of any oil based brands of airbrush paint?

Poppy Paints is a brand of oil-based colors.  I know 'Evil Cake Genius' sells them, specifically for airbrushing on chocolate. And I think 'Global Sugar Art' sells a line of oil-based airbrush colors as well.