The Formula Of Special Color Special Care Technology protects and stabilizes the pigmenrt particles in the dyed hair . This formula can also effectively stabilize the saturation the hair pigment and retard the loss of them . It has obvious and efective effects in color fixation / color sustainment / color protection. The hair color fading period can be delayed to more than 3 times later compare to ordinary hair color products. 2) The Scientific formula has a powerful function of hedging and removing yellow . After continuous use the hair will not appear to be yellow or dull after a relatively long period of dyeing