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No. 4

Vol. 42, No. 4, pp. 305–312, 2008

The Reaction of Oxidative Hair Dyes in Cuticle Layers

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The mechanism of oxidative hair dyes (permanent hair color) in cuticle layers of human hair was studied. In general, it is considered that the oxidative hair dye deposits monomer into the cortex, and is polymerized with coloring in there. It was confirmed that not only cortex but also cuticle layers were dyed with the permanent hair color, through observation with the thin cross-section of the dyed hair. There were exogenous metals in the cuticle layers from tap water etc., and the transition metals increased the dyeing and decreased the bleaching. It was thought that the activity of oxidation reaction with hydrogen peroxide was increased in the cuticle layers, and permeability to the cortex was decreased. Furthermore, TEM findings suggested that the oxidation hair dyes mainly reacted in the β-layer/ δ-layer interface in the cuticle layers, unevenly distributing the metals in the β-layer of cuticular CMC. Keywords: 

hair, oxidative hair dye, hair color, bleach, cuticle, transition metal, ultrastructure, CMC, β-layer, oxidative reaction
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Document Type: Abstract

Affiliations: 1: General Research & Development Institute, Hoyu Co., Ltd., 1-12, Roboku, Nagakute, Nagakute-cho, Aichi 480-1131 2: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan 3: School of Medicine, Aichi Medical University, 21, Karimata, Yazako, Nagakute-cho, Aichi 480-1195, Japan

Publication date: October 1, 2009

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