Karen, I had several black cakes to make, and previously, when I had to make black fondant out of white then adding black, never had the exact color I wanted and by the time I did, the fondant itself became very soft. I often turn to my savior :-) Jo from Ciccio Cakes who recommended I buy ready-made black for my black cakes and if you have a lot of leftover (cos here I can only buy in 5kg buckets) you can freeze them!!
Dina @ miettes, http://www.facebook.com/pages/miettes/257790597632317