<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16608" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Very interesting article, Wim. I just read most of it and 2 things jumped out. End grain of wood is most harmful, and of all species, basswood is listed as most harmful.</FONT></DIV> <DIV><FONT face=Arial size=2>Fenton</FONT></DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=l-bartlett@sbcglobal.net href="mailto:l-bartlett@sbcglobal.net">Leslie Bartlett</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">'Pianotech List'</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, March 21, 2008 11:01 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> RE: lead corrosion revisited</DIV> <DIV><BR></DIV> <DIV dir=ltr align=left><SPAN class=641200018-21032008><FONT face=Arial color=#0000ff size=2>I just filed the corrosion off a set of Sohmer keys, and then sprayed lacquer on them.......  No idea if it will work. I filed past the corrosion.....</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=641200018-21032008><FONT face=Arial color=#0000ff size=2>les bartlett</FONT></SPAN></DIV><BR> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left> <HR tabIndex=-1> <FONT face=Tahoma size=2><B>From:</B> <A href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</A> [mailto:pianotech-bounces@ptg.org] <B>On Behalf Of </B>Willem Blees<BR><B>Sent:</B> Wednesday, March 19, 2008 11:35 PM<BR><B>To:</B> <A href="mailto:Pianotech@ptg.org">Pianotech@ptg.org</A><BR><B>Subject:</B> lead corrosion revisited<BR></FONT><BR></DIV> <DIV></DIV><WBR>At our meeting last night, one of the members brought up something very interesting. He did some research and found information from "Lead Corrosion in Exhibition Ship Models- Carderock Division of NAVSEA Warfare Center. (<A href="http://www.dt.navy.mil/cnsm/lead_01.html">www.dt.navy.mil/cnsm/lead_01.html</A>.)<BR> <BR>In a nutshell, it is not necessarily high humidity that causes lead to corrode. It seems that wood and glue causes lead to corrode. All woods contain acetic acid, which causes lead to corrode. It is also the chemicals found in glues and even the punchings. <BR><BR>But what is interesting is, why are some leads susceptible to corrosion, and not others? The consensus amongst the other three techs here, is that 25 year or older Sohmer and Kimball pianos are the worst. At least here in Hawaii. What is it in the make up of the lead in those pianos that causes them to corrode? I have found a few pianos back in St. Louis with this problem, but not as many as here. (I've done 10 sets of keys out of about 225 pianos, just since I got here) Although other pianos have that problem, it is very seldom. It happens only occasionally in Asian made pianos, but then there aren't that many that are more than 30 years old. <BR><BR>Just thought I'd share that information with you guys.  <BR><BR> <DIV style="CLEAR: both">Willem (Wim) Blees, RPT<BR>Piano Tuner/Technician<BR>Honolulu, HI<BR>Author of <BR>The Business of Piano Tuning<BR>available from Potter Press<BR>www.pianotuning.com</DIV> <DIV class=aol_ad_footer id=u8CA585AD48873A3-106C-43CB><FONT style="FONT: 10pt ARIAL, SAN-SERIF; COLOR: black"> <HR style="MARGIN-TOP: 10px"> Planning your summer road trip? Check out <A title=http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000015 href="http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000015" target=_blank>AOL Travel Guides</A>.</FONT> </DIV><BR> <P><FONT size=2>No virus found in this incoming message.<BR>Checked by AVG.<BR>Version: 7.5.519 / Virus Database: 269.21.7/1335 - Release Date: 03/19/2008 9:54 AM<BR></FONT></P></BLOCKQUOTE></BODY></HTML>