Patent ID: 7004981

Claim:
A hair-coloring method comprising coloring hair having virgin hair portions and already-colored hair portions, wherein: (A) the virgin hair portions are colored with an oxidative hair-coloring agent (I) comprising an oxidative dye, ammonia, hydrogen peroxide and pure water and having an ammonia concentration of 0.2 to 3.0% by weight and a hydrogen peroxide concentration of 2.5 to 5.0% by weight and being prepared by mixing a first agent containing the oxidative dye in an amount of 0.01 to 3.0% by weight, the ammonia and pure water with a second agent containing the hydrogen peroxide and pure water, and (B) the already-colored hair portions are colored with an oxidative hair-coloring agent (II) comprising an oxidative dye, ammonia, hydrogen peroxide and pure water and having an ammonia concentration of 0.1 to 1.5% by weight and a hydrogen peroxide concentration of 0.01 to 2.0% by weight and being prepared by mixing a first agent containing the oxidative dye in an amount of 0.01 to 3.0% by weight, the ammonia and pure water with a second agent containing the hydrogen peroxide and pure water.