美发师理论基础知识大全（Hairdresser Basics）.doc

美发师理论基础知识大全（Hairdresser Basics） Hairdresser Basics Basic knowledge is always the important foundation of practice and innovation. As a Ni Wei end can not only master the skills of beauty salons. We should keep in mind the basic theoretical knowledge, and more in-depth understanding of beauty salons. One hair structure 1 epidermal layers: the epidermis hair is the outermost layer is composed of overlapping layers of horny plates, the edge towards the ends. 2 cortical layers: cortical layer is the second layer of hair is the middle layer, it is a bunch of fibroblasts from paste ring material impregnated with ammonia, hydrogen and salt containing keys, keys, two keys and sulfide keratin, hair natural pigment particles. The stylist to study the dyeing in cortex, permanent color is produced changes in the cortical layer and form. The cortical layer accounts for 80% of the hairs. 3 medullary layer: in the center of the hair is the medulla layer, which is composed of transparent and polygonal cells separated from each other, which is not necessary for hair dyeing. Two, the role of hair dye Hair dye products are basically divided into 3 kinds: temporary dyes, semi permanent dyes, permanent dyes. 1 temporary dyes: This is a water soluble dye, it does not enter the hair cortex, temporarily attached to the surface of the hair, a wash off. 2 semi permanent dyes: in a class of hair color, you do not have to add any oxidant. No oxidative polymerization occurs in the infiltrated cortex. Keep it for 15 days 3 permanent dyes: almost all permanent dyes are guided by oxidation involving aniline. These dyes penetrate the cuticle of the hair and into the cortex. This kind of dye must add H2O2 (peroxide), so they are also called oxidation dyes. Usually kept for 3 months. Permanent dyes are usually used in 1100% covered with gray hair. 2 increase or reduce the natural hair color luster. 3 Polish bleached hair. 4 increase the color of natural hair. Three bleach principle 1 bleach principle