Is the cream made from potassium hydrogen tartrate (cream of tartar) and hyrdogen peroxide? And if so, what percentage is the hydrogen peroxide, 3% which is commonly available or 35% (more or less) which is available from janitorial suppliers or is it food grade hydrogen peroxide available from online suppliers? Or, is this cream already made in a tube or jar? Henry Nicolaides Southern Illinois University > Date: Thu, 22 Apr 2010 08:58:26 +0100 > To: pianotech at ptg.org; caut at ptg.org > From: JD at Pianomaker.co.uk > Subject: Re: [CAUT] [pianotech] restoration > > At 15:39 -0700 21/4/10, David Ilvedson wrote: > > >These YouTube videos of a Steingrabber & Sohn upright is well > >done...good craftsmanship. In the 2nd one he uses 30% hydrogen > >peroxide in the Sun to whiten the ivories > > The prior sanding of the ivories was quite unnecessary. The job > could have been done with just peroxide (the cream, as I said, is > more convenient and labour-saving) and the ivory polished afterwards. > This way you lose no thickness of ivory. A few months ago I bleached > a set that was far worse than this Steingraeber without needing to do > any sanding. I don't use a buffing wheel to polish the ivory either > since that abrades the softer "summer growth" more than the harder > parts and it is always detectable. After bleaching I remove any > scratches with P800 - 1200 wet-n-dry and then polish with chalk and > alcohol on a hard block covered with white sheep leather. It's > almost as quick and leaves a glass-like surface. > > I found his way of removing the chase bushings painfully slow and > inefficient. All he needed to do was soak them and leave them for a > bit before pulling them out clean with small flat-nose pliers. No > chisels (I noticed his knife was terribly blunt -- cfr. our Moroccan > turner's perfect chisel) no files. His glue was also overcooked and > sticky. > > JD _________________________________________________________________ Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_1 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100422/d78145cc/attachment.htm>
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