Children like bright colors and they also like doing crazy things to their hair; this is especially true on Halloween. The thought of coloring hair with bright colors is often much more attractive than the final result. Knowing how to use Kool-Aid or Jell-O as hair dye is an inexpensive, creative, and temporary way to satisfy your children's curiosity and complete their Halloween costumes. Apply Kool-Aid or Jell-O to hair the night before Halloween to make Halloween day a less stressful one.
Apply petroleum jelly to the areas of face near your child's hairline. This creates a barrier so the dye does not drip and dye your child's face.
Mix three packages of unsweetened Kool-Aid or a box of Jell-O into a bowl with a couple drops of water. Sweetened Kool-Aid or Jell-O results in sticky hair. Add a couple drops of conditioner to the mixture, and stir it together. The mixture should be more of a paste than a liquid. Use a Kool-Aid or Jell-O flavor that matches the desired color of hair. For example, "Lime" flavored Kool-Aid or Jell-O tends to be green, dyeing the hair green, "Cherry" flavored Kool-Aid or Jell-O tends to be red, dyeing the hair red, and "Grape" flavored Kool-Aid or Jell-O tends to be purple, dyeing the hair purple.
Use a hair dyeing application brush to work the dye onto the hair. Put a shower cap over your child's head and leave the mixture on the hair overnight. Remove the shower cap, shampoo and condition your child's hair and let it dry.