5 minutes at a time. A color treatment for gray hair that dyes your hair to a beautiful shiny ideal color. This is a color treatment that means that you can easily & easily dye your gray hair to your ideal hair color at home.● Leave it on for 5 minutes at a time. The ``W color ingredients'' of ionic color & ultra-small molecule color penetrate the hair which deeply colors gray hair each time you use it giving it a beautiful natural color.● Added `` Color Fix Cuticle Coat'' that cares for the cuticle. Prevents color fading & maintains the luster of freshly dyed color.● The function of caring for frizz prevents the undesirable appearance of gray hair & leads to youthful & beautiful hair.● Contains abundant natural serum ingredients such as coenzyme Q10. With its damage repairing power worthy of the name of the treatment it conditions the hair & keeps it healthy.● With no diamine-based dyes it is gentle on the hair & scalp & has no irritating odor so it can be used every day as a trea...