[pianotech] What is this?

[Matthew Todd]

Thanks so much John and Tom.  Now, the question is, is there something to use to treat this, or will it be okay left alone?  This substance is no where else inside or out on the piano, except on the plate.


TODD PIANO WORKS 
Matthew Todd, Piano Technician 
(979) 248-9578
http://www.toddpianoworks.com

--- On Mon, 5/17/10, John Delacour <JD at Pianomaker.co.uk> wrote:


From: John Delacour <JD at Pianomaker.co.uk>
Subject: Re: [pianotech] What is this?
To: pianotech at ptg.org
Date: Monday, May 17, 2010, 10:16 PM


At 13:27 -0700 17/5/10, Matthew Todd wrote:

> This link should work!  Anyway, I would appreciate thoughts as to what this is.  The piano is a Kimball.
> 
> <http://farm5.static.flickr.com/4027/4616647986_6f5a441ac5.jpg>http://farm5.static.flickr.com/4027/4616647986_6f5a441ac5.jpg

It is a salt or a mixture of salts of copper, commonly called verdigris, caused by chemicals in the atmosphere reacting with the copper in the bronzing powder.  This would not happen if the bronzing had been effectively lacquered over with an impermeable lacquer.

JD

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