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The team say that the pH-sensitive adhesive system could serve as a novel, and recyclable, middle ground between structural adhesives with fixed chemical bonds and peel-off adhesive films that bond using physical interactions.

You can also have a peel-off backing to make your photo print a sticker.

You should be able to find it on your post office receipt, shipping confirmation email, or the bottom peel-off portion of your tracking label.

“You want to take the techniques that they’re working on and say, ‘OK, do a flyby or do a roll-off or a peel-off, something like that.’

Several are looking at postage-paid envelopes as well as switching their style of envelope to feature a peel-off adhesive that eliminates the need for licking.