<html> <body> As I recall, the one D has two fifty watt rods and one 38/25 watt rod under the belly plus another 38/25 under the keybed.  All of this is under a thick Steinway quilted cover.  The pattern of corrosion is more reminiscent of condensation then it is of mano manipulation.  The piano is kept secure pretty much all of the time and is out from under its cover only when on-stage before a concert (also unplugged :-X). The storage room it is in varies from 60-72% Rh that I have measured while there.  The rods are always warm, the keybed one is funny on the knees.  They have agreed to add a climate-controlled closet to the budget for the D, sometime next year.  The only improvement I can think of is a string-cover.  Wool has that water storage/buffering ability and for condensation you have to have temperature cycling. I think it should help.  Maybe it is only happening on stage. Andrew Anderson initials etc. At 04:14 PM 11/14/2005, you wrote: <blockquote type=cite class=cite cite="">On Nov 14, 2005, at 4:03 PM, Andrew Anderson wrote: <blockquote type=cite class=cite cite=""> I am looking for solutions for our high quality instruments to keep the strings from rusting.   All of them have some level of corrosion developing.  All are a few years young.  They all have quilted covers.  One has a DC dehumidifier system under it. </blockquote> I'd go with more dehumidifier systems, minimum of two dehumidifier rods each, and undercovers.  If they're putting their fingers on the strings, nothing's going to stop the corrosion.  Jeff Jeff Tanner, RPT University of South Carolina </blockquote></body> </html>