You can mix with several things - you can go back through the threads - but mix with water is standard. You can mix with acetone to get a stronger dye. You can mix with dishwasher soap for a more viscous solution. I think it kind of depends on the dyeing technique.
Personally, I don't use any heat, so I mix my dye powder with water. Then I mix with shaving cream (either on a bed, or painted on). Usually have to do several applications to get a dark color. I need to try out the soap solution this winter.
Personally, I don't use any heat, so I mix my dye powder with water. Then I mix with shaving cream (either on a bed, or painted on). Usually have to do several applications to get a dark color. I need to try out the soap solution this winter.