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To meet the most up-todate guidelines on preventive conservation, in recent years several scientific projects supported by the EC were aimed at developing innovative tools that could complement the standard methods for environmental monitoring in museums. Accordingly, an evaluation of the impact of the whole environment on art objects is recognized as an essential requirement for conservation purposes. Each factor does not act individually, but its effect can be enhanced or accelerated by the presence of other factors. The phases of development and testing of this novel light dosimeter are presented in detail, from the early design to the final product.ĭifferent physical and chemical factors, such as light, temperature, relative humidity, pollutants and so on, can affect works of art on display. By means of this reference colour scale, the colour exhibited by the dosimeter after an exposure can be easily correlated to a quantitative indication of the light dose received. Finally, the calibration was carried out and a reference colour scale was provided for fast and easy reading of the indicator. The behaviour of the indicator in the field in selected museums and historic houses was assessed in parallel with the laboratory experiments at each development stage. The impact of other factors unconnected to light (such as temperature, humidity, indoor air pollution – atmospheric and volatile organics – and oxygen) was also studied. The light-induced alterations under study were evaluated using various light sources and illuminance levels. The colour variation was investigated under different environmental conditions. Initially blue, the colour successively changes through purple and pink to white, under the effect of visible light. The indicator is characterized by a progressive colour variation as the exposure to light increases.
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This indicator, named LightCheck® Ultra, is composed of a photosensitive dye/polymer layer applied on a paper support.
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This paper presents the development and optimization of an ultrasensitive light dosimeter, especially designed for the preventive risk assessment of damage to highly photosensitive artefacts.