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The free alkali content of the hair dye is the key to affecting the quality. If the pH is too high, under alkaline conditions the scalp and easy expansion, dye intermediates penetrate the hair dye in alkaline easily oxidized color, and accelerate the dyeing speed; in the hair dye process, however, a strong alkaline dyes which easily lead to skin irritation, while storage will accelerate dye intermediates oxidation rate, shorten the shelf life. If the PH is low, the oxidation reaction has not been completely the same bow I played dyeing effect weakened. Generally dye part of the pH value is about 9-11.The hair dye聭s viscosity should be controlled to a certain target when it is in preparation and operation. Because viscosity of the dye is also involved in the effect of dyed hairs. If the tretinoin viscosity is low, in the process of hair, it could easily lead to contaminate scalp, clothes.The assembling line of the cordless hair dryer includes a renewable power source such as a rechargeable battery which enables the dryer to use at any place even without attaching to an electric point. And, once the battery is exhausted, it can easily be recharged at your convenience. Then, its motor assembly has also been configured with a flow controller and a temperature controller. Also, the hose of a cordless hair dryer has also been configured with a cap with a plurality of apertures for varied dispensing of airflow. Then, the other assembling parts of a cordless hairdryer include a fan, heating element and a switch to put the hair dryer on and off. Many people tend to wash their hair regularly, and thus require a hair dryer to quick-dry their hair. In addition, the professional hair-stylists also use hair dryers to style people's hair after a cut.