Hi Guys.  Kevin McElhone wrote, "I always store my musical box discs
in heavy duty PVC storage bags."

One does need to be a bit careful here, because some grades of PVC
deteriorate with time and start to produce corrosive acidic discharges,
which do your discs no good at all!

A museum conservator (Jonathan Holmes, any comments?) could probably
help us with info on which grades are okay and which are not, and
possible sources of supply.  A sign of deterioration is the material
turning yellowish after a few years.  I understand the bags supplied
by a certain museum in West Sussex produce these discharges.

David Evans in UK