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Explanation: How long do I leave it on?
It is worthwhile noting that blonde shades take less time to colour. Grey hair is more resistant than natural non-grey hair, although pure white hair takes blonde shades easily. If the degree of colour change required is minor you need far less processing time, even on grey hair. This is not the same as traditional peroxide colouring where colouring bleached hair is unsatisfactory and does not last at all well.