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The effects of light on photos...
The public’s interest in photography has resulted in a significant increase in the number of exhibitions where images may suffer from excessive or prolonged lighting. Alone or combined with other environmental parameters such as temperature, humidity or pollution, lighting induces photochemical reactions that lead to changes in the appearance of a wide range of materials that make up the showpieces. Some prints, ancient or modern, thus show significant damage during temporary exhibitions, resulting in a yellowing or discoloration of the images. The challenge is always to assess the dose of light irradiation the showpieces receive, so as to avoid any excessive exposure.
In partnership with AXA-Art, chemists from Paris are developing a new indicator designed to monitor sensitive works of art. This dosimeter consists of a photosensitive colour layer applied on paper. Depending on the colour it takes after exposure, the dose of light to which the showpieces are exposed can be estimated. This is a particularly effective prevention tool because it allows an early assessment of the risks faced by the photographs exposed to light. It is therefore an active warning device that helps implement appropriate control measures and exposure conditions.
Centre de recherche sur la conservation des collections, CNRS-MNHN-Ministère Culture et communication
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