Good question,
I have recently been through I phossick box I bought
at auction, that has approval sheets in cellophane.
Presumably some had been sealed in the 60's
and have travelled extremely well, seemingly
pristine after all these years in a medium by all accounts
is not well advised.
I have most of my collections in glassine, yet just yesterday
found a site that advised, "under no circumstances" keep
stamps in these see through envelopes.

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"Steve" wrote in message ...
| I've received stamps in Kitchen "Zip-Loc" bags and store some
| common used stamps in them.
|
| How safe or how bad are Zip Loc bags for stamp storage of extras?
|
| Thank you,
| Steve
|
|
|