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Tinture Per Capelli :

The purpose of the dyes is to give the hair a certain type of color, different from the natural one bestowed on it by melanin. There are different types of hair dyes. We can distinguish the plant, the metal, the temporary and finally the synthetic ones. The generic term tincture is mainly referred to synthetic ones. Vegetable dyes : Here the term dyeing is used improperly. In fact, these substances are not able to color the entire hair evenly, but merely give it colorful reflections. Hair dyesPlant dyes are extracted from plants, are not allergens and/or irritants but have a limited range of colors. Once applied, they bind to the hair with weak hydrogen bonds, so the color conferred has a temporary and non-permanent resistance. Henna is a dye plant substance that gives dark hair a red-orange color with coppery reflections, while on blonde or light hair produces red-carrot reflections. Another plant substance is AZULENE, which is extracted from chamomile by squeezing flowering tops. The azulene is a reflector for blond or light hair. The third plant-dye substance is INDACO, which is extracted by maceration from plants belonging to the Indigofer family. The indigo itself gives a blue coloring; This is why it is used in association with henna in order to give the hair a red-brown reflection. The molecule responsible for the blue coloration is the indican, which in turn through hydrolysis origin wearsile, which will be oxidized to form the indigo. Gradual or metallic tinctures These dyes give the hair the desired color in a very gradual way, so repeated applications are required. Gradual dyes are mainly composed of metal salts capable of forming metal oxides, or reacting with sulfur-containing compounds (originating metal sulphurs), such as keratin, cistine and cysteine. The salts in question are lead acetate and bismuto, copper, nikel, cobalt or manganese salts. The typical coloring formulation is that of lead acetate in watery glycerin solution; It has a number of features: It works very slowly to give the desired coloring; Accents the coloring of dark hair; In addition to lead acetate, silver nitrate (AgNO3) can be used, which is only used in eyelashes and eyebrow products. The maximum concentration is 4%. This substance gives a bright black coloration to light, because in contact with it the silver nitrate originates pure silver. Silver nitrate has a certain toxicity to humans; In fact, the product says it can be harmful, keep away from the eyes.

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