METHOD FOR TREATING HAIR

A method for treating hair, in which using as a boundary a depth X% in a range of 5% to 80% from the surface of hair toward the center along the long diameter axis extending through the center of the cross-section of hair, hair is divided into an A layer (a portion of a continuous color from the sur...

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Bibliographic Details
Main Authors KURAMOTO, Kyoko, NAGASE, Shinobu, IIZAKI, Takeshi
Format Patent
LanguageEnglish
French
German
Published 29.07.2020
Subjects
HUMAN NECESSITIES
HYGIENE
MEDICAL OR VETERINARY SCIENCE
PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS
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Summary:A method for treating hair, in which using as a boundary a depth X% in a range of 5% to 80% from the surface of hair toward the center along the long diameter axis extending through the center of the cross-section of hair, hair is divided into an A layer (a portion of a continuous color from the surface of hair to the depth X%) and a B layer (a portion including the center and having a continuous color different from the A layer, in which the depth from the surface of hair exceeds X%) and at least one value of ΔE*, Δh and ΔC* between the color of the A layer and the color of the B layer is adjusted to 3 or more to change the hue and the color tone of hair appearance depending on viewing angle of the hair. A method for dyeing hair, having Step (I) of dyeing hair with a two-part permanent hair dye agent, and Step (II) of dyeing hair with a hair dye agent comprising a dye selected from (A-1) to (A-8).
Bibliography:Application Number: EP20180786428