Pre-softening Hair
A: Pre-softening is simply the process of lifting the cuticle layer of the hair to speed up the penetration of a chemical service. In a color service, this usually involves applying color developer (hydrogen peroxide) to the hair prior to applying then color mixture.
The raised cuticle means that the color penetrates more effectively into the gray hair and makes covering gray much easier and gives truer color results.
This becomes important in some gray hair types as gray hair can often become more compact and resistant as it loses pigmentation.
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See also:
How to dye hair
Color resistant gray hair
Guidelines for covering gray hair with hair color
