What on earth kind of a unit is 12%/40 vol? I've ground my way through quite a few college chemistry courses back in the day, and I've never heard of such a beast. Terry Farrell On Nov 1, 2010, at 11:46 AM, John Delacour wrote: > At 12:00 -0300 01/11/2010, John Ross wrote: > >> The bleaching process will require 30% peroxide, not the normal 3% >> that is in the drugstore. (not exact numbers) >> I believe that hairdressers have a bleach that will do the job. >> Sunlight with the peroxide are used. > > As I have said on several occasions before it is absolutely NOT > necessary to use bomb-quality peroxide. 12%/40 vol, which is the > standard hairdresser volume or 18%/60 vol will both work fine and > are what I have used on thousands of ivories over many years. > Perhaps you are confusing vols with percentages. > > JD
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