Good question. I know the thermal paper ones turn black, they also turn black if you put them in an old film container. Too much heat. I think that's why you weren't supposed to laminate. But the ones you print don't do that. I think the note not to laminate is a carry over, it doesn't change because the system doesn't know what paper is being used. I don't know but I guess the only way to know for sure is make a phone call to the CO. If anyone knows for sure please post. I would love to laminate mine instead of print off a few dozen each year.
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