What is "decolorizing" in hair treatment?

Decolorizing in hair treatment specifically refers to the process of lightening natural hair color using chemicals, such as bleach. This process involves breaking down the melanin in the hair strands, which is the pigment that gives hair its color. By using decolorizers, hair can be significantly lightened to achieve a desired shade, whether for fashion purposes or as a base for further coloring. It is an essential technique in hair coloring that allows for a broader range of color options afterward, as it creates a lighter canvas on which various tones can be applied.

The other choices pertain to different hair treatment processes. Temporary color applies color that will wash out after a few shampoos, while darkening hair involves adding pigment instead of removing it. Removing product buildup is a completely different treatment concerned with cleansing the hair rather than altering its color.