Лако-красочные материалы — производство

Again, issues of discoloration and performance are important. In addition to hair substantivity, retentivity on the body must be con­sidered. In general, the perfume dosage in a shower gel or bath product is double that for shampoo, so the effect of any potentially discolouring ingredients is accentuated. The higher perfume level certainly helps fragrance retentivity. However, substantivity on skin is usually less than that on hair for three reasons. Firstly, the skin is warm and hence the rate of perfume vaporization is higher. Secondly, the skin con­tinually secretes other chemicals onto the surface, which can interact with deposited fragrance. Lastly, the skin is less porous in nature than hair, so potentially fewer binding sites are available for the perfume molecules. If the product is destined for the bath, then diffusion from the bath water becomes important.