I dyes have the unique aesthetic function to revive or change the natural color of the skin surface. For this reason they must be very irritating and stable over time.
is classified on the basis of the solubility of the dye in the form of cosmetics which it is added:
1 - DYES, soluble in the medium.
2 - PIGMENTS , insoluble in the middle.
3 - TONER , insoluble in all media and used pure.
4 - LAKES, insoluble in all media and diluted with inorganic substances.
The dyes can be of synthetic or natural origin.
Those are the synthetic nitrates, yellow-orange, the azo red, orange and yellow, the xanthene , blue, green and yellow, the anthraquinone derivatives of red, orange and yellow and triphenylmethane derivatives.
Among the natural colors are the carotenoids (beta-carotene), the flavonoids (anthocyanins), the chlorophylls, pigments and .
natural dyes are better than synthetic ones, but with less stability, so they are less used.
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