This should be a lesson to all genealogists, archivists, historians, and to anyone with old documents or pictures they would like to preserve: Don’t laminate them!
Back in the 1950s, many people thought that laminating something was a method of preserving it. Even some archivists recommended laminating old documents. As the years went by, these people learned the folly of their recommendations. Laminating something actually hastens its deterioration.
For 20 years, beginning in the 1950s, the state of South Carolina laminated documents to protect them from aging. However, a chemical reaction caused the documents to deteriorate faster than they would have had they been left unlaminated. The natural acids from the paper mix with the degrading laminate to create a noxious vinegar. Each passing year will further degrade the document until it’s gone.