For Acid Migration we have terms and definitions in 2 topics. The topics are Archival and Book Collecting.

Acid Migration (Archival)

The transfer of acid from an acidic material to a less acidic or pH neutral material. This may occur directly, when the two materials are in intimate contact. For instance, acid may migrate from boards, endpapers, and protective tissues, as well as the paper covers of books and pamphlets to the less acidic paper of the text.

Acid Migration (Book Collecting)

The acidification of a book or part of book by contact with something that is acidic. Acid is destructive to paper and cloth in that it breaks the long fibers of into shorter fibers thus making them more fragile. It also often causes discoloration. One of the most common senarios may be seen in older books where the pastedown end paper, and often the free endpaper as well, have been discolored from proximate contact with the board that forms the front and back cover of a hard cover book. This discoloration may look much like foxing, and indeed, is frequently misdescribed as "foxed endpapers". Typically, staining from acid migration damage to the end paper is more solid in coverage than real foxing. Often, you will see a distinct line of demarcation near the edge of the endpaper where the turn-in of the binding material has blocked or neutralized the acid. Often the mull, the linen strip beneath the endpaper near the spine will have the same effect. Acid migration may also come from cardboard boxes, or even wood shelving. It is a slow and gradual process. The rate cannot be predicted as it will vary enomously depending on the relative pH's of the materials, and is heavily dependent on environmental factors.

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