Implementación de un Método colorimétrico para el Control de calidad de tintes capilares producidos en los Laboratorios René Chardon del Ecuador.

Abstract

The hair color industries of the world have been implementing instrumental methods that allowed the quantification of the exact color tones in hair colors, expressing them in numerical relation; allowing to establish quality parameters that can guaranty the correct tone between batches. The method used by the René Chardon of Ecuador actually consists on an empirical release mechanism assessed by visual perception, which varies, as the results are limited to the expertise of the analyst, in addition it cannot be quantifiable, reason why there is no follow up on the tonality. The trust on the brand and the results that the client hope for it is going to lose value, as soon as the client notices the deviations of the tone of the color on the final product. The research evaluates two colorimetric methods to determine numerically the tones of the capillary colors. The former method is based on the extraction of the capillary pigments that are expressed on wicks of hair with related solvents, determining that the best treatment for the extraction of capillary colors, is based on the extraction with methanol using agitation on an ultrasonic bath during two hours. The second method proposed uses HunterLab MiniScan EZ colorimeter that provides colorimetric coordinates, the different mathematical combinations distinguish minimal differences in color between batches. The lightness (L*), the tone (h*), the chrome (C*), and the global difference of color (ΔE), were studied using batches of analogs capillary colors, specifically Borgoña (code 4.5), light brown (code 5.0) violet golden cinnamon (code 5.35); made in different periods of the present year. From this comparison, the operative procedure (IO.251.2.36) was done, and this methodology was apply to the control quality system for the production of hair color. Considering as a criteria of acceptance a coefficient of variation lower than 5%.