then try and find the same color.
cause if you start mixing colors, you'll be in for a surprise lol.
as far as heat, it depends on your stove, mine is like heat 1-8, and i set it to 8 till it starts to boil then turned it down to 5 or 6 and let them soak for like 20 min, maybe longer, just periodically lift them out of the dye and see if your diggin the color.