able to pigment the hair in various chromatic shades, cover white hair, create special effects or reflections.
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Over the years, research has allowed us to develop different types of dyes, but the best known remains the one based on ammonia. This covers, together with the coloring molecules, the hair structure of the desired color, penetrating deeply into the hair fiber. Currently, the products are much less aggressive, as plant pigments have replaced chemical ones.
. However, the most common of hair dyes remains the classic oxidation in a basic environment, in which the intermediate ingredients react with each other and give a fairly long-lasting color to the hair fiber. which is found inside their medulla, but also from the ability to reflect light, therefore from the porosity and the superficial layer of the hair fiber. From the physiological point of view, with the advancing age, the melanocytes present in the hair follicles they gradually lose the ability to produce melanin and the graying process begins, so many people resort to cosmetic hair coloring.
