Might be DMSO. Ask your client if she is taking anything for Arthritis. There is a Medical grade of the stuff that passes through the body out via the breath, (lungs). It can cause that sort of thing and worse. Only thing to slow it's progress is a Damp-Chaser. Joe Joe Garrett, R.P.T. (Oregon) Captain, Tool Police Squares R I > [Original Message] > From: <pianotech-request at ptg.org> > To: <pianotech at ptg.org> > Date: 10/19/09 11:40:30 AM > Subject: pianotech Digest, Vol 12, Issue 163 > > Send pianotech mailing list submissions to > pianotech at ptg.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://ptg.org/mailman/listinfo/pianotech > or, via email, send a message with subject or body 'help' to > pianotech-request at ptg.org > > You can reach the person managing the list at > pianotech-owner at ptg.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of pianotech digest..." > > > Today's Topics: > > 1. U1 - stained bass strings (Rob Mitchell) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 19 Oct 2009 11:31:52 -0700 > From: "Rob Mitchell" <tpa2sfr at pacbell.net> > To: <pianotech at ptg.org> > Subject: [pianotech] U1 - stained bass strings > Message-ID: <000601ca50ea$6e137a20$4a3a6e60$@net> > Content-Type: text/plain; charset="us-ascii" > > I've been working with Yamaha on this, but the best we've come up with is > that some sort of atmospheric contaminant is attacking the strings. Thought > I would try this group to see if anyone has seen the problem. This is on a 4 > year old Yamaha U1. > > > > As you can (hopefully) see from the pictures, this is a very unusual > phenomena. It looks to be some kind of ink or marker in some very odd > places. It occurs on ALL the wound bass strings under the damper felts and > at the hammer strike points. For the damper felts, the stain is exactly at > the contact point between the felts and strings. For the monochords, the > stain wraps around the string. For the bi-chords, the stain is between the > strings from the wedge. It's as if someone used ink-soaked dampers and > hammers to check for damper contact and strike point. (The hammers and > dampers themselves on this piano are normal and show no signs of the stain). > The stain is not just on the surface of the coils -- it seems to be all the > way into the grooves. > > > > Furthermore, both the L and R strings on B1 (as well as some other strings) > have the markings smeared from the dampers almost up to the tuning pins. > And there is an every-fourth-string marking again closer to the tuning pins. > All the strings look completely normal and free of the markings below the > dampers. I tried some fine emery paper on a B1 string and the marks seemed > to scrape off fairly easily. I didn't want to try anything more aggressive > like alcohol, wire brushing or steel wool. > > > > The customer's concern is that at a minimum, this diminishes the resale > value of her piano and at worst, might be something that would accelerate > string wear/breakage. > > > > Anyone seen this before? > > > > Rob > > > > Mitchell Piano Service > > (415) 994-1030 > > www.mitchellpianoservice.com <http://www.mitchellpianoservice.com/> > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091019/88d605f0/attachment .htm> > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: P1010451.jpg > Type: image/jpeg > Size: 165611 bytes > Desc: not available > URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091019/88d605f0/attachment .jpg> > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: P1010453.jpg > Type: image/jpeg > Size: 125080 bytes > Desc: not available > URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091019/88d605f0/attachment -0001.jpg> > > ------------------------------ > > _______________________________________________ > pianotech mailing list > pianotech at ptg.org > http://ptg.org/mailman/listinfo/pianotech > > > End of pianotech Digest, Vol 12, Issue 163 > ****************************************** > > > -- > Internal Virus Database is out-of-date. > Checked by AVG. > Version: 7.5.560 / Virus Database: 270.12.26/2116 - Release Date: 5/15/09 6:16 AM
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