Easy. Hide the gray hair that you care about by just painting. It gradually stains every time you use it gray hair becomes less conspicuous. Covering the newly growing gray hair on the hairline. Arcuate brush easy to paint fine parts. Quickly dry hard to soil hands & skin. Strong against sweat & water color is difficult to fall down. Using 2 to 4 times the gray hair becomes dyed & it becomes less noticeable.