US Patent No. 11,065,185 B2 (Nobuhito Mukai, Takashi Mukai); Sunnyplace Co. Ltd., Taito-ku, Japan, has patented a hair coloring that entails applying a mixture in a predetermined ratio. The mixture has two components: a hair coloring agent comprising at least a basic dye, an HC dye, a second amino acid, a first cationic surfactant, a thickener, an oil agent, a first pH adjuster, and a wetting agent, wherein the hair coloring agent has a pH of 6.8 or more; and a hair cosmetic comprising at least ...