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For other uses, see "PAT (disambiguation).

Photographic Activity Test is an "ISO [1] standard test detailed in ISO 18916:2007 (E). Previous versions of the standard were numbered ISO 14523:1999(E); however, it was updated and renumbered in 2007.

The test evaluates materials for archival quality and their use in "photographic enclosures. Many different types of materials can be tested including: "paper, boards, "plastic, "adhesives, "pens, "stickers, "labels, "paints and "inks. The test involves incubating samples and detectors in a high-temperature, high-humidity "accelerated aging environment.

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