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Posted By: Paul

I've now looked at it under a microscope, and my guess is that it's glue or shellack or some such thing. Each of the spots is invisible under the microscope, except that you see a series of very fine cracks in exactly the same area where the spots should be. The cracks are not visible without a microscope. I'm guessing that someone must have splattered something clear on the card and, with age or drying, it cracked.

The other possibility is that N284s have some kind of shiny gloss on them that cracks with age (like T207s), and all that remains of the shiny gloss on my card is a few spots.