"So don't use adhesives. Nobody advises the use of any adhesive as an "archival" solution anymore, not even wheat paste. Use polyester or mylar photo corners instead."
It was nothing to do with mounting methods - which haven't been mentioned. Nor was it a question of "not using adhesives" - rather it was a problem with incidental or short term contract with some types of adhesives. As I mentioned, the tape the manufacturer used to fix the end of a roll - which [art of the roll is normally "wastage" effected not just where it was stuck on, but also three or four layers down in the roll, leaving a bright yellow stain gradually fading the deeper the layer. Use of adhesive tape in packaging prints - say masking tape on paper wrapped around mounted prints could have the same effect. I saw it happen from an assistant leaving a roll of tape on top of a pile of unprinted paper overnight. A couple of days later, the circular "pictogram" of the tape roll showed up on 5 consecutive sheets - nice and bright yellow. I've seen reports of the same bright/warm yellow could showing up over a whole sheet. No idea what the sheets came into contact with that caused it.
All that said, the manufacturer seems to have fixed the problem in the paper as I haven't heard of it showing up for a while now.
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