ChrisRis@AOL.COM wrote: > > Dear Paul, > > You still haven't told me what causes the green goop on Steinway centers! > Christopher Dear Chris, OK, so your question is not so much "What is verdigris?" but "Why does it happen to Steinway centers?" The only explanation I can offer is that the bushing cloth must be slightly acidic and/or the alloys in the pin are not effective in retarding corrosion. I suspect that a chemical analysis of both, and of the verdigris itself, would put the matter to rest and give you the answer you're seeking. That's a worthy project, but I don't know who's going to do it. Paul
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