Hello, I am not aware of aluminum screws being used on any piano simply because aluminum is brittle, or weak depending on the grade. Not sure. Could it be zinc oxide? I would clean and see if the metal is compromised. Good Luck Mark Perry From: yiddishtangofever at shaw.ca To: pianotech at ptg.org Date: Thu, 21 Jan 2010 19:51:30 -0800 Subject: [pianotech] aluminum oxide? Hello, I just noticed on the piano I was tuning today that the metal screws are covered with white powdery residue. Is this aluminum oxide and do the screws need replacing or can this be cleaned off? Thanks Zoe _________________________________________________________________ Hotmail: Powerful Free email with security by Microsoft. http://clk.atdmt.com/GBL/go/196390710/direct/01/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100122/6b301690/attachment.htm>
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