If you have a perm, we recommend that you wait at least two weeks after your perm treatment before applying hair color.
We also advise you to shorten the exposure time by 5-10 minutes, as wavy hair is more porous and therefore absorbs the color more quickly. However, we would not recommend lightening tones such as 9.0 or 9.1 for wavy hair.
But if you have white hair, it's not a problem because you add the color and the hair doesn't have to be lightened.
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