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The Internal Structure of Hair Observed Using a Differential Phase Contrast Scanning X-Ray Microscope
There are many reports on oxidative polymerization reaction mechanism of oxidation dye intermediates so far. Among them, there is the theory that it is not necessary to oxidatively polymerize oxidation dye intermediates on the surface or inside the hair when dyeing on the hair. This study was carried out to clarify the dyeability of oxidation dye to hair and the possibility of hair dyeing method using oxidation dye. First, the oxidation dye intermediates were oxidized and polymerized in advance to obtain oxidation dyes. The dyeing was carried out by two types of dyeing methods, a pre-oxidation method using an oxidation dye and an oxidation method which oxidizes an oxidation dye intermediate. Hair stained with oxidation dye of p-aminophenol(pAP) / p-amino-o-cresol(pAOC) coupling dye became bright orange, and hair stained by oxidative polymerization of pAP and pAOC became dull orange. The surface reflectance curve and the K / S time curve of the oxidation dye showed that it was dyed with the same dyeing mechanism as the disperse dye common to hair. Furthermore, it was confirmed that it can be dyed in various hues similarly to the method of dyeing by oxidatively polymerizing the oxidation dye intermediate, when dyeing by mixing the oxidation dye. We also confirmed that the oxidative dye stains the cuticle and its adjacent cortex area. Multiplicity of use of oxidation dye as a dyeing agent is high, and it is expected to be applied to future dyeing agents.
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