and more can be factors in these "archival at the time of manufacture" sleeves. Bill Cole has an article which addresses some of these issues........ (
http://bcemylar.com/paperdocs.cfm). Much like the variety of paper & printing on various card sets, the variety of ingredients in the items we use to protect them can change composition over time... These issues have not been addressed or dealt with long term by the companies which slab the cards, so there may be some BIG surprises down the road...
