Final answer:
The hair would typically go through 8 to 10 levels of decolorization to reach a platinum level.
Step-by-step explanation:
In the decolorization process, the hair goes through several levels to reach a platinum level or stage. The number of levels depends on the starting color of the hair. If the client has darkest brown or black hair, it would typically go through 8 to 10 levels of decolorization to reach a platinum level.
The decolorization process involves the use of an oxidant, such as hydrogen peroxide, which breaks down the natural color pigments in the hair. As the hair is decolorized, it goes through various stages of lightening, from dark brown to medium brown, light brown, dark blonde, medium blonde, light blonde, and finally platinum.
It is important to note that the exact number of levels and the time it takes to reach a platinum level may vary depending on the hair's condition, thickness, and the type of hair dye and developer used.