<HTML>Listers, I had a tuning today on a brand new Kawai RX-3 6 foot 2 grand.  The= piano has been in the house for maybe 3 months.  It was closed up tigh= t, but when I opened it, I saw that rust was already starting to form on the= strings and on some of the pins.  I was shocked, and was at a loss to = figure out how this could happen, especially in a house with radiant heating= (that's another issue).   It is on caster cups on a painted cement slab floor, and there are no pl= ants in the room. I had a few ideas, and I'm pretty sure I figured out the reason for this= early oxidation, especially after talking to the rather freaked-out owner t= onight. So what, in your esteemed opinions, might this be caused by? Dave "rust never sleeps and neither do I" Stahl</HTML>