* Because of the function of alkalescence during the coloration, .
* hair squama is damaged and then opens. .
* Acid shampoo is highly developed for its acid characteristics, .
* which can balance the PH value of hair automatically. .
* It will not only clean the hair but also repair the hair squama at the same time. .
* Thus makes it possible to maintain the long-last durability of the shining and natural dyed color. .