I'm hoping someone on the list can help me with this.  Our 1928
Lindemann baby grand has suddenly developed strange blotches on
either side of the case.  It looks a little as it might if someone
had started to strip the finish and then changed their mind, but
we haven't done anything at all like that.

The top and fallboard are not affected -- just the two sides.  One
side faces a window, but the other one doesn't, so I don't think
it's sun-related.  And we haven't had any water or humidity issues,
although the room is a little dry in the winter.

Does anyone have any thoughts about what might be causing this,
and any ideas for either short-term or long-term solutions?

Thanks,
Paul Lehrman - Tufts University
Medford, Massachusetts