I recently had an "issue" with a local photo-processing shop. Not a BB...locally owned. A regular customer had "enlargements" made to frame. Wanted them dry-mounted. Something showed up on the photo, what I thought was a small spot of adhesive, and when I tried to wipe it off with Undo (UnSeal?), what I've successfully used on photos for years, the ink came with it! ACK!!
A quick call to the photoshop to re-print, found it was not a "photo" after all , but an ink-jet (he called it a Giclee) print that was not stable with Undo. And he said heat should not be used for mounting. How would I know that? I sure do now!
Sure looked like a "photo" to me! And we think the adhesive spot might've come from inside of the cardboard print sleeve it was delivered in. Weird!He has since changed his print sleeves to non-seamed ones.
I think I will no longer drymount photographs. After all these years, I can no longer tell the difference, unless the processor gives me precise mounting instructions. And then, I will still be suspicious.