Your concern about using plastic sleeves to store stamps and its long term effects is a good question. Here is a link to a website that discusses this topic

Stamps and Plastics

I can't give you a definitive answer but I hope the article on this website can point you in the right direction.

Last edited by BellaOnline; 10/05/10 06:46 PM.

Gary Eggleston
Stamp Collecting Editor