How do hair colourants work 'with your natural colour'?

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Offline DoctorBeaver

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These hair colourants that claim to "work with your natural hair colour" - how? How can the same colourant be used on different hair colours but still work?

Personally, I use L'Oreal because I'm worth it  [:D]


Mod edit - formatted the subject as a question.  Please try to do this to help keep the forum tidy and easy to navigate - thanks!
« Last Edit: 24/07/2008 14:41:31 by BenV »
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