Photographic Activity Test

{{Short description|Evaluation of archival materials}}

{{Primary sources|date=October 2021}}

Photographic Activity Test (PAT) is an ISO standard test detailed in ISO 18916:2007 (E), updated in 2007. Previous versions of the standard were numbered ISO 14523:1999(E).{{Cite web |title=ISO 18916:2007 - Imaging materials — Processed imaging materials — Photographic activity test for enclosure materials |author= |website=ISO |date=October 2007 |url= https://www.iso.org/standard/31940.html}} Current as of 2020

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.