Chemistry & ProductsQuestion 91 of 484
After a chemical service that raises the hair's pH (such as relaxing or permanent color), an acidic 'normalizing' or finishing rinse is used to:
a.Lighten the hair further
b.Lower the pH and help the cuticle lie flat
c.Open the cuticle to add more color
d.Disinfect the scalp
Explanation
Acidic finishing rinses bring the hair back toward its natural pH (around 4.5 to 5.5). This helps the cuticle close, locks in color, and reduces frizz.
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