Dyeability of Oxidative Permanent Hair Coloring Agents and the Damage of Hair

Abstract

Abstract:In this study, we investigated the effects of oxidative permanent hair coloring agents on the dyeability and the damage of human hair. p-phenylenediamine and toluene-2.5-diamine sulfate were used as a hair coloring agent precursers. The degree of dyeability was checked by the change of CIELAB L* value according to dyeing time. And the damage of hair was evaluated by the tensile strength and morphological change of hair in SEM. When the hair was dyed, the CIELAB L* value was decreased with dyeing time regardless of the type of precursers. But when the hair was dyed after nutritional treatment, the CIELAB L* value showed lower level. This means that the nutritional treatment covers the scale of hair and protects the hair from the chemicals.

The physical and chemical disruption of human hair after bleaching – studies by transmission electron microscopy and redox proteomics

“…Oxidative damage in hair has been investigated at these various structural levels using a variety of techniques. Molecular‐level changes to hair proteins can be examined using mass spectrometry , amino acid analysis and UV‐Vis absorption , whereas holistic evaluation such as changes in colour and tensile properties , or structural examination with light and electron microscopy can characterize the effects of oxidation at the ultrastructural and microstructural levels.…”