If I'm not mistaken, the "Queen Mom" of soap making, Kathy Miller, uses crayons to color soaps occasionally. I think I read that years ago when I was a newbie reading her site. I'll check. They are OK for kids to eat, so I would not have a problem using Crayola brand crayons. Checking, will report soon.
I found it! As quoted directly from Kathy's site:
"Color: Candle color works very well for soap when mixed into the fats before the lye solution is added (if it's wax based - melted first, separately, in a few tablespoons of the fat and then poured into the rest of the melted fat). You can find these at a hobby store or mail order them from companies such as Pourette. Some people use CRAYONS in the same way, but it takes more since they are rather dilute and you don't always get the end color you are expecting. Some experimentation might be in order. Generally I will suggest you use 1 to 3 regular crayons for the size of the recipes you will find on this site, depending on how strong a color you desire." END QUOTE
Paul.... :wink: