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. Also check out this site. http://www.h2o2.com/intro/techdata.html I had been replying specifically to > I've tried soaking very yellow ones in hydrogen peroxide to whiten them > up, and that worked pretty well, but required several prolonged soakings. > So the next time, to speed it up, I tried Clorox, and that was too much - > they came out over-bleached and chalky. But maybe if it were diluted > enough . . .(?) > --David Nereson, RPT John M. Ross Windsor, Nova Scotia, Canada jrpiano at win.eastlink.ca ----- Original Message ----- From: "John Delacour" <JD at Pianomaker.co.uk> To: "Pianotech List" <pianotech at ptg.org Sent: Thursday, August 02, 2007 5:18 AM Subject: Re: Removing key fronts > At 3:49 am -0300 2/8/07, John Ross wrote: > >>The hydrogen peroxide has to be the 30% stuff, not the 3% commonly >>available stuff. > > I think you mean 30 volumes and not 30%. 40 vol (12%) is the normal > recommendation but 60 vol (18%) is also obtainable at least in England. > >>Also it should be used in conjunction with sunlight. > > As I stressed also in my reply -- the key being ultraviolet rays. > > JD > >
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