Getting disease problems as related to moisture results from other agents in
the moisture or that react with water.  Along with humidity control, the
next line of defense is control of the materials that come into contact with
the shells.  Several other Conch-Lers will be responding with details.
Right now my time is short.  So, I'll refer you to an article about Byne's
Disease.
http://z14.invisionfree.com/Conchologist_Forum/index.php?showtopic=216

Marlo
  -----Original Message-----
From: Conchologists List [mailto:[log in to unmask]] On Behalf Of GARY
FREDRICKSON
Hi All,
Spring is only approaching up here in northern Wisconsin which means
increases in relative humidity. For space reasons some of the collection is
in the basement. Winter is not a problem because the air is so dry but the
warmer months require a dehumidifier. Mine can be set to maintain a certain
level. My question is what is a safe humidity level for the shells before
you start getting disease problems. Clearly the few extra bucks to let it
run constantly are nothing compared to the cost of the shells but I'm still
curious about what museum collections or even private collections consider
an optimum humidity level. Thanks.
Gary

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