Re: Senna & chemical dyesPosted by iris on August 6, 2004 at 17:43:18: In reply to: Senna & chemical dyes posted by Zina on August 6, 2004 at 16:37:20: I've done it both ways - highlights (with peroxide) over cassia'ed hair, and cassia overhighlighted hair. nothing weird happened. but it's always a good idea to do a strand test... having said that, if it's true that the weird reactions with synthetic dye over henna and vice versa come from metallic salts added to henna, then it seems unlikely that you will get strange things with senna. unless they add metallic salts to senna as well, but why would they do that? iris
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