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Use of heat is necessary for results

As ONC products do not contain chemicals to open the cuticles. After the color mix is on the hair. Use the thermal heat cap, or medium heat from a hair dryer. This opens the cuticles so the color can go into the hair. Only use heat on the roots or regrowth hair. The thermal heat cap is healthiest. As it opens the cuticles using trapped heat from the head. It also prevents overheating, which dries hair out. Don't forget - USE HEAT!

ONC artofcolor Thermal Heat Cap and girl with hair dryer
 
Men do no need to use heat. Apply. Allow 30 minutes for full gray coverage. Or 15-20 minutes for a 'salt and pepper' look. Rinse.

The thermal heat cap holds body heat and helps to open the hair cuticles to let color in. Its use does not ensure color results.