<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" = http-equiv=Content-Type> <META content="MSHTML 5.00.2614.3500" name=GENERATOR></HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Hi,</FONT></DIV> <DIV><FONT face=Arial size=2>I always wondered what that was, but = not enough to ask.</FONT></DIV> <DIV><FONT face=Arial size=2>Now I know.</FONT></DIV> <DIV><FONT face=Arial size=2>Thank you.</FONT></DIV> <DIV><FONT face=Arial size=2>Regards,</FONT></DIV> <DIV><FONT face=Arial size=2>John M. Ross</FONT></DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: = 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A href="mailto:rrg@nevada.edu" title=rrg@nevada.edu>Robert = Goodale</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = href="mailto:pianotech@ptg.org" title=pianotech@ptg.org>pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, June 02, 2000 = 3:55 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: pressure bar = powder</DIV> <DIV><BR></DIV>What we have here is a case of old fashion ion = oxidation.  Many cheep pianos from the 60's and 70's, (particularly 70's), used = cadium plated screws.  Many other parts, however, were still nickel = plated, (i.e. pressure bar).  Thus the nickel metal and the cadium metal chemically react with each other, (like NiCad batteries),  and = you get a dull greenish-yellow oxidation.  I have seen this on a lot of = cheep spinets too where they used cadium screws to hold nickel plated = brackets in place on the keys which hold the stickers. <BR>  <P>Rob Goodale, PRT <BR>Las Vegas, NV <BR>  <P>Doug Garman wrote: <BLOCKQUOTE TYPE="CITE"> <STYLE></STYLE> <FONT face=Arial><FONT size=-1>From time to time I open an = upright and find the pressure bar and screws coated with a light yellow-green = powder.  What is this?  Oxidation?  How should I clean this off, or = should I?  Saw one yesterday on a Wurlitzer spinet (2-pedal).</FONT></FONT> <FONT face=Arial><FONT = size=-1>Thanks --- Doug Garman  :o)</FONT></FONT>  </BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>