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I’m pretty sure it is toning, though certain materials might be more susceptible to it I guess.
I'm wondering if these are like the series 16 beige backs. Those are uniformly beige and similar to each other. I agree these die cuts look tone but the glue or something must be different that they age completely differently
Could it boil down to the manner of long-term storage by the previous owner(s)? I’m thinking along the lines of how much browning you would see in a 50-year old comic book that’s been thrown into a box in the attic vs. one that’s been bagged first.How do the borders look on the fronts? Are they more off-white than typical, consistent with the backs?