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Home › Colouring of keratinous fibers using a pretreatment comprising an iron salt and a colour developer comprising hydrolysable tannin

Colouring of keratinous fibers using a pretreatment comprising an iron salt and a colour developer comprising hydrolysable tannin

US Patent 8152859 · Granted Apr 10, 2012

Estimated economic value: $3,825,000 ⓘ

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