> The papers, particularly the rice paper that was popularly used by
many,
> leave behind particles during the rubbing process. These
particles/fibers expand
> when they get wet (ie rain). This in turn breaks down the stone's
surface very
> quickly.

Sorry to drift off topic, but as cemetery preservation volunteers,
this is one that's dear to our hearts. Kind of like the question
about "should we even box in cemeteries," there are lots of differing
opinions on doing headstone rubbings. More and more of the New
England cemeteries we're aware of are discouraging this wonderful
practice. It's mainly a wear and tear issue...kind of like staying on-
trail as much as possible. For those interested, here are a couple of
terrific links on the subject.

http://www.savinggraves.org/education/bookshelf/damage.htm
http://www.savinggraves.org/education/print/rubbings.htm
http://www.cyndislist.com/cemetery.htm

Jay in CT