Look up the kinds of hairdyes used in countries where PPD is banned? That's the suggestion my boyfriend gave me once when I was fussing about the chemical. I haven't yet acted on it, mostly because I'm happy with henna.
A semi or demi permanent would also be a thing to consider, as those (to my understanding) don't really use PPD. Since you'd have to update the roots anyway, I'm not sure how much more maintenance a demi or semi would be over a permanent dye.
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