Somewhere in the past I have heard the suggestion to put the item in the freezer for a couple of days.
Jim
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stampmanjack APS Life Member 07 Jun 2017 01:56:29am
re: (Glassine stuck on back)
I have had postage like that - thankfully lower face value - and I have had good luck with breaking the glassine with a sharp pointed tons at one of the bends and then workin it back and forth very slowly and effectively popping the glassine. Many times, I was able to save the whole sheet although not always. Icebox first is a great idea.
stampmanjack
I may give the freezer trick a go here. This almost complete sheet has glassine stuck to much of the back of it. You can see it at the top of the page, to the left of the BEP logo on the top selvage.