I posted this link on another stamp board and thought it would be useful here.
https://stamps.org/preservation-and-care
Vince
FYI, just highlight the link and click on the "link" button below to make it a hyperlink.
https://www.postalmuseum.org/discover/collections/philatelic-collection/caring-stamps-postal-history/
A few more...
http://www.loc.gov/preservation/care/paper.html
http://www.niso.org/publications/tr/tr01.pdf
Don
fine article here with useful links ...
https://www.postalmuseum.org/discover/collections/philatelic-collection/caring-stamps-postal-history/
re: archive materials ...
I posted this link on another stamp board and thought it would be useful here.
https://stamps.org/preservation-and-care
Vince
re: archive materials ...
FYI, just highlight the link and click on the "link" button below to make it a hyperlink.
https://www.postalmuseum.org/discover/collections/philatelic-collection/caring-stamps-postal-history/
re: archive materials ...
A few more...
http://www.loc.gov/preservation/care/paper.html
http://www.niso.org/publications/tr/tr01.pdf
Don