The invention discloses a preparation method of
pigment constituents of cortex juglandis mandshuricae, namely
polyphenol and
juglone parts of cortex juglandis mandshuricae, and also provides different-
colored hair dyes of cortex juglandis mandshuricae and a hair
dyeing method thereof. Each different-
colored hair dye comprises an agent A, an agent B and an agent C which are used along with each other, wherein the agent A comprises, by weight, 0.5-1% of
vitamin E, 1-5% of a
metal salt
mordant, 1-10% of a surfactant, 1-5% of a
thickening agent and the balance being deionized water; the agent B comprises, by weight, 5-30% of one or two of the part I and the part II of cortex juglandis mandshuricae, 1-10% of a
plant penetrant, 3-9% of
hydrogen peroxide, 1-5% of a
thickening agent and the balance being deionized water; and the agent C comprises, by weight, 5-30% of one or two of the part I and the part II of cortex juglandis mandshuricae, 1-10% of a
plant penetrant, 1-5% of a
thickening agent and the balance being deionized water. The invention has advantages as follows: the preparation is convenient and efficient; raw materials are easily available; and the constituents of cortex juglandis mandshuricae can be repeatedly utilized. The different-
colored hair dyes belong to natural
plant extracts, are safe and reliable, have various color systems and are suitable for colored
dyeing of
black hair, white hair and grizzled hair.