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Of course, you are correct – materials in an artifact can cause even “archival” materials to deteriorate. It is a problem I see often in small museums – it is hard to think that archival enclosures can deteriorate especially if you paid a premium to get and use the best materials. Everything ages even if it is an an archival enclosure or if it is an archival enclosure. We have to keep an eye on the aging of the enclosures as well as the artifacts. Certainly, archaeological materials can be very complicated composites – especially once you factor in the matrix and soil. In that case, it might be good to think of having several types of materials in enclosures – say a tissue wrapping before placing the sample into a bag. This last, is just a thought.