acid migration

   The transfer of an acid from an acidic material to a less acidic or pH neutral material, most often from one with which it is in contact. Since acid can cause certain materials, such as paper, and the mats, mounts, etc. with which they are framed, to discolor and to deteriorate, acid migration is one of the factors to be considered in planning the storage of various artifacts, especially textiles and works on paper, including books, pamphlets, museum records, etc. Also see adhesives, archival image, art conservation, and buffer.

Glossary of Art Terms. 2014.

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