I have never seen black, I always buy the dark brown ones and if it really needs to be black then I add black candy color. It still takes a lot and it will make the candy taste a little weird. They do make red candy melts and they are great!
Go to www.candylandcrafts.com; do a search for candy writers, they have them in all colors, including black. That is what i use when doing chocolate transfers and i use the black writer for the outlines. That is where i go all the time and they are great!
I did a web hit for black candy melts and it kept populating Wilton's method for black. Mix red and blue together....
I never tried it because I never had true blue melts in the house but it may be worth a try...
Hope this helps. 
Go to www.candylandcrafts.com; do a search for candy writers, they have them in all colors, including black. That is what i use when doing chocolate transfers and i use the black writer for the outlines. That is where i go all the time and they are great!
How big of a hole is in the tube? Approximately what tip size would you say it would be? Can you get really fine lines?
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