Is Koleston hair dye forbidden or permissible?
It is permissible to dye with the aforementioned substance if it is pure and causes no harm to the human, for Allah has subjected to us what is in the earth for our benefit, and has forbidden what harms us out of mercy. It is obligatory to avoid imitating the disbelievers by dyeing gray hair black, as there is a prohibition against it.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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