Colouring treated hair with Henna

The henna hair kits found in stores, yes even health food stores, are not pure.  They contain chemicals or metallic salts.  Unfortunately, those tainted kits are the only ones that hairdressers are educated on.  Pure plant dyes (henna, cassia, indigo, etc..) can be used on treated hair.  But a test is always recommended, some regions have high mineral content in the water which can react with Cassia.


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