The use of tea polyphenols and/or tea pigments as active ingredients in a dye and combined with metal salts for dying human or animal hair, or the use thereof in preparing a hair dying product for humans or animals, and a hair dying product or hair dye combined product comprising tea polyphenols and/or tea pigments. The advantages thereof include lasting hair color and natural luster free of irritation, allergies, mutation, harmful effects to hair quality, as well as simplicity, convenience, and speed.
