This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hi, I always wondered what that was, but not enough to ask. Now I know. Thank you. Regards, John M. Ross ----- Original Message -----=20 From: Robert Goodale=20 To: pianotech@ptg.org=20 Sent: Friday, June 02, 2000 3:55 PM Subject: Re: pressure bar powder 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.=20 =20 Rob Goodale, PRT=20 Las Vegas, NV=20 =20 Doug Garman wrote:=20 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). Thanks --- Doug Garman :o) =20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b7/93/2c/a4/attachment.htm ---------------------- multipart/alternative attachment--
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