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Thanks Mrs C and FGT, she's only here til Tuesday and going back to auzzie after that, and actually she's only staying with me until tomorrow. Apparently it's really expensive for the hairdressers in auzzie land. So if we used one of these strippers or the bleach, would it be ok to add a temporary colour straight after? Can't really see her going back to auzzie land with a faded hair colour!
joke - her hairs been dyed black for ages, it's definitely not going to wash out unfortunately, the only other thing she could do if the above doesn't work is grow it out.