At 8:52 am -0300 2/8/07, John Ross wrote: >I said what I MEANT. > >In this area the term % is used, when I order it in the Drugstore. >(Chemist for you) >Mind you I might be out in the exact %, it might have been 35%. >It does get confusing, doesn't it, the terminology difference >between countries. The relationship between vols and percent is explained here <http://en.wikipedia.org/wiki/Hydrogen_peroxide>. As I said, I always use 12% (40 vol) or 18% (60 vol) in a cream and the results are quite rapid. I would hesitate to use anything stronger for fear of uneven bleaching or even damage to the ivory, though I have no evidence that it could do damage. I used to stand in the sunshine painting on the liquid peroxide until I practically went blind before I doscovered the cream peroxide, which stays active for many hours and requires no operator presence. JD
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