When you want to touch up your roots in between dyes or highlights you can do so easily with a hair dye crayon. Also known as touch up sticks, hair dye crayons are pigmented wax sticks that temporarily stain the hair and last between one and two shampoos. The process for making a hair dye crayon involves making the wax, which creates that crayon-like mold, and mixing in the hair dye that corresponds with the hair color you are trying to match.
Place the double boiler on the stove. Fill the bottom of the double boiler with 6 inches of water. Set the top lid piece of the double boiler on top, over the water. Turn on the stove and bring the water to a boil.
Empty a tin vegetable can. Wash it thoroughly to remove residue and allow to dry. Fill the can halfway with spoonfuls of the paraffin wax. Set the wax-filled vegetable can on top of the double boiler so that the boiling water heats and melts the paraffin wax.
Add 1 tablespoon of hair dye cream into the melting wax. Stir the wax and colored cream around with a stirring utensil. Watch the color of the wax change into the color of the cream. Hair dye cream is a ready to wear type of hair dye that you can purchase from a beauty supply store. Add more hair dye cream -- by the tablespoons -- to brighten the color.
Remove the double boiler from the heat. Pour the dyed wax into a crayon mold. Allow the wax to cool and, as it does, it solidifies into a hair color crayon. Once the crayon is solid, apply it to the roots of your hair by rubbing it back and forth over the hair strand until the color wipes onto the hair.