Easy Comb-In Hair Colour. Easy: Comb-In Applicator Allows For Controlled Application To Where The Grey Is: Certain Areas Or All Over. Shuts Off: Shuts Itself Off So It Can'T Go Too Dark. Always Looks Natural. No Mix, No Mess: Just Comb-In, Shampoo Out. Takes Only 10 Minutes. Gentle: No Peroxide. No Ammonia. Leaves Hair Feeling Soft & Manageable. Long Lasting: Permanent Grey Coverage. Lasts Up To 6 Weeks Until The Grey Grows Back.