Photo Activity Test (PAT)

Photo Activity Test (PAT)

Definition: The Photo Activity Test (PAT) is a standardized procedure used to assess whether materials-including adhesives, papers, plastics, and other framing or storage products-are safe for use with photographic or archival materials. The test evaluates potential chemical interactions that could cause fading, discoloration, or deterioration of photographic images over time.

Purpose and Importance

• Ensures the longevity and preservation of photographs, negatives, and other sensitive materials.
• Identifies reactive or unsafe materials that may emit harmful chemicals or acids.
• Supports conservation best practices in framing, storage, and display of photographic works.

Test Procedure

• Materials are exposed to a photographic test strip under controlled conditions.
• The test evaluates any fading or color shifts in the photographic emulsion caused by the material being tested.
• Passed materials are deemed safe for long-term use in archival framing and storage.

Applications in Framing and Conservation

• Selection of mat boards, adhesives, tapes, and backing boards for archival-quality photo framing.
• Validation of packaging materials for storing or shipping photographic prints safely.
• Ensures that framing components do not accelerate fading or degradation of sensitive artwork.

Related Terms

• Photoshop
• Photograph
• Photo
• Photo Engraving