rusted piano strings

[Ron Nossaman]

> I'll buy what you say Ron. Some of that did occur to me, but I felt that 
> the strings would warm fairly quickly and that any short period of time 
> where a small amount of moisture might be on the strings would not be 
> significant. Perhaps doing that twice a week (don't forget Wednesday 
> evening), 52 weeks per year, over some number of years is enough to 
> become significant.
> 
> Terry Farrell

That's the closest I've come to making sense of the rusty 
string thing. I've seen pianos sit in fairly high humidity but 
steady environments and not rust strings, and pianos going 
through fairly wide but slow swings with similar result. 
Abrupt changes in temperature and RH% seem to be a big factor. 
Beyond that, ??????

Ron N