Hello, information from Shiseido, the operation of
4MSK does not work with Bleaching process. (synthesized by the source, partly
Salicylic Acid ) where
Salicylic Acid is considered in the Skin Bleaching group. The team therefore provides information based on the structure of the substance. [which in fact The mechanism of action should be similar to the structure of the substance, but the developer of the substance itself. It may be worth highlighting that the substance works by other processes as well. not through the bleaching mechanism alone]