AIve achieved getting black with cocoa powder, my issue is getting a dark red and green. Those are the colors I need for a Gucci cake. I only have wilton gel colors and.i would have to order Americolor online. Is there a way to get those colors dark?

I airbrush mine when I need it to be red or black but I found this site. Never tried it but it seemed to work well for her. I am sure it would work for green as well.

http://sugarsweetcakesandtreats.blogspot.com/2010/11/recipe-red-marshmallow-fondant-mmf.html