If you can't start with chocolate, start with coloring your icing a light brown and then go up with the black.. I had to do this recently with my monster truck cake... the mom didn't want chocolate icing.. see my photos, it was super black!
Start with chocolate icing as the base, then add the black coloring. Also, letting it sit for a while will only help the color to become darker.
This is what I do as well. The chocolate icing works really well and you don't have to use alot of black coloring. be sure to let it sit a couple minutes and you'll see how nicely it darkens.
Rhonda
Another tip is to color the icing a few days in advance. It will darken as it sits.
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