when i make black fondant I normaly use chocolate fondant, and then I add black and blue till I got the black color.
But last week i made a mickey mouse cake, and i dooesn't have chocolte fondant, so, when i made an experiment: when i was melting marshmallows, I add a lot of black and brown.....actually t was a mess!...when i finally made the fondant the color i get was like purple....and then i add more black and blue, and brown......i think the blue is the key to make black fondant.......After adding a lot of food coloring, i finally got black (real black!)
but the taste was horrible!if you are going to deliver this cake to a costumer,is better to buy satin ice black fondant.I made it for my cousin so.....anyways we never taste fondant because is too sweet....i hope it helps...