Hair dyes can be divided into temporary hair dye, semi-permanent hair dyes and permanent hair dyes. In accordance with the formulations of classification, it can be divided into cream type, gel type, moss type, powder type, hair color bars and rinse.
The hair dye is the biotin cosmetic which can change hair color. Hair can be dyed different colors of different shades of color cosmetics. Chinese hair products are defined as special purpose cosmetics. So-called special purpose role between medicine and cosmetics in China will be included in the cosmetics regulations management.
The most important hair dye hair cosmetics on the market today are a permanent hair dye, the use of dyes: natural plant type, metal salts and the oxidized dye. One of the most commonly used is the oxidized dye. Two formulations of such products, a dye-containing matrix, can be a cream, powder or water main dye-phenylene diamine; other agent is the oxidant, the main ingredient is hydrogen peroxide and minoxidil.They can be equipped with into the aqueous solution, can also be dubbed in the paste matrix or powder, two agents the amount of mixed use, and then evenly brushing the hair, water rinse after 20-30 minutes coloring.
The mechanism of permanent hair dyes hair: hair dye contains ammonia or alkaline ingredients scales of the hair layer to open, the dye molecules (intermediates and coupling agent or modifier) and oxidant to penetrate the hair cortical layer, while the occurrence of oxidative condensation reaction, dye oxidation NCKU molecules, remain in the cortex, showing the target color.
The vast majority of Asian hair color is black or dark brown, the cuticle of the hair gathered in a large number of melanin factor, relatively speaking, Asian hair is more thick hair thicker, and therefore are difficult to stain the hair types. Change hair colors from the hair in principle, on the one hand you want to fade inherent part of the hair pigment, on the other hand to increase the number of new pigments, these two processes simultaneously to derive the final results.
Hair dye can dye black hair lightly. They usually contain hydrogen peroxide and ammonia. The higher the concentration is, the stronger the ability to fade melanin becomes. The hair can be dyed shallower. In the hair dye process, what can not be ignored is the result of the same cosmetics material hair dye will vary from person to person. The hair color is actually a mixture of the results of your natural hair color with the selected hair color. In terms of Asians, in order to have the ideal hair effects, the most important thing is to choose the right color and also adhere to the correct method to use the product according to their specific situation.
Source:http://www.cosprm.com
The application of tungsten in various industries
Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
Magic effects of coconut oil
According to records, coconut oil can be regarded as the nobility of skin care plant extracts. It was rich in exotic tension of tropical plants, which can enhance the contractile force of the pores, perfectly beautify and nourish the skin.
Exploring the Potentials of Nano-Aluminum Powder
Nano-aluminum powder, a material with remarkable properties due to its minuscule particle size, is revolutionizing various industries with its high reactivity and large specific surface area. Unlike its bulk counterpart, nano-aluminum powder begins to oxidize at a lower temperature of 550°C, compared to the 950°C oxidation point of ordinary aluminum. This lower ignition energy and full combustion without apparent cohesion make it a superior choice for applications requiring high energy and efficiency. The unique characteristics of nano-aluminum powder, such as faster burning rates and greater heat release, are largely influenced by its synthesis method, which determines its particle size, surface area, and shape.
