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the basic requirement of dyeing hair dye is not to affect the skin, do not damage the hair structure, dyeing to be rapid, bright colors and strong. It has a wide variety of oxidizing dyes on the market. First brush on the hair with a reducing agent dye, then apply oxidizing color agent, to meet the color requirements and then wash off with shampoo. The formula is: reducing fluid is 4.3% aniline, formaldehyde 3.0%, sodium sulphate (95%) 4.4%, hydroxymethyl cellulose 10%, water 77.7%. Oxidizing color agents usually use 3 to 6% hydrogen peroxide solution, but also used sodium borate 94.7%, citric acid 2.1%, glucose esters 3.2%. It should be noted that aniline substances have microtoxicity, some people will be allergic.