My hair is colored or bleached or permed, can I still do the test?

Hair color, dyes and tints do not affect the test because they contain chemicals, not minerals, but
it’s best to wash the hair at least once after applying a tint, dye or color rinse before cutting a
hair sample.

Bleach, highlights and perms can alter the structure of the hair. So either sample the hair before a
treatment or after you have washed the hair five or more times following a lightening, bleaching
or perming treatment. The hair tends to re-balance after five washings. Since highlights are done
on the surface of the hair, you can simply sample a piece of hair that has not been highlighted on
the underside of your head.

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