As you may know, it is difficult get your fondant to be a solid black or red-they often come out as gray or pink. Well, I've discovered an easy and effective way to get a deep, dark black.
You have to make your own fondant to begin with. A single batch calls for 1 cup of marshmallows and 1 TBSP of water. Instead of water, I used liquid black food coloring (not the gel paste) in place of the water (1 TBSP). I then proceeded as normal for the reminder of the recipe. I did add a few globs of gel paste just to make sure it would be black, and man was it black! Black as pitch. And it only took me as long as it took to make white fondant. So easy.
I will try this technique with red someday. For this next cake ( which I will post in a day or so), I used HALF my container of red gel paste and I only got semi-red.