Measurement of Dyed Hair Color and Evaluation of Anionic Surfactants on Dyed Hair

• Published in: Journal of Society of Cosmetic Chemists of Japan Vol. 36; no. 2; pp. 102 - 110
• Main Authors: Uchida, Sakiko, Uehara, Keiichi, Yoshioka, Masato
• Format: Journal Article
• Language: English
• Published: The Society of Cosmetic Chemists of Japan 2002
• Subjects: anionic surfactants; color evaluation; color laser-microscope; decoloring; dyed hair color; evaluation methods; SEM; sensory testing; sodium lauroyl hydrolyzed silk; sodium POE lauryl ether sulfate; three primary color values; triethanolamine N-lauroyl glutamate
• ISSN: 0387-5253; 1884-4146
• DOI: 10.5107/sccj.36.102

Popularization of hair dyeing and the increase in the number of hair colors have required the development of accurate evaluation methods for dyed hair color. Although color evaluation has been generally carried out by sensory testing with the naked eye, the results have not been satisfactory because this method is not an objective evaluation. In order to develop an evaluation method for the color of dyed hair, we have adopted a color laser-microscope for the measurement of three primary color values. In our study, a correlation between the three primary color values and sensory testing with the naked eye was recognized, suggesting to us that this method by which three primary color values are measured is a useful tool for the evaluation of the color of dyed hair. Furthermore, when we studied the effect of decoloring and damage prevention on dyed hair caused by cleansing with anionic surfactants using the newly developed evaluation technique, we recognized obvious differences among the three anionic surfactants with regard to their decoloring and damage prevention effect. The result showed that treatment with sodium lauroyl hydrolyzed silk caused less decoloring and less hair damage on dyed hair.