Hersute wrote: "The replacement hair has a 6% creme peroxide developer & 20% for my own hair."

This is quite genius! When I color a new piece I use the same mix on its hair and my own and all is well. But when I come to recolor it a month down the line the piece hair colors faster than my own so I try to time it by applying to my own first, then the piece, but often the two don't come out 100% perfect. This idea of yours has got my interest.

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Hersute - what are those percentaages equivalent to in vol numbers such as 10,20,30,40? The bottles I get are 10 vol. I have used 40 in the past for bleaching.