Design and validation of tailored colour reference charts for monitoring cultural heritage degradation

Abstract Colour changes of cultural heritage objects can be related with degradation materials, thus a proper colour monitoring system used to detect conservation problems. With this purpose, methodology for preventive based on tailored reference charts and image analysis is proposed. Reference have been designed tested use in museums. Charts containing 64 patches printed using high-stability inks 4 different substrates: Acid-free paper SkyLight, covered propylene film, FOREX® GlassPack. The stability has studied by accelerated ageing an UV chamber, the harmlessness materials Oddy Test. final selection material, laminated paper, balance between change upon performance Using material proposed design, copper silver coupons assessed images that are adjusted calibrated adaptive calibration framework employing given set colours which homogenises visual information supplied images. Thus, regardless camera origin, any processed picture will deliver reliable state metal surfaces at moment it was taken. Results demonstrate adequacy approach design calibration, so these monitor sensitive –metal coupons– photographs. As metals consequence corrosion environmental factors may as measure air quality museum environments. This low-cost tool, where –or other materials– followed through pictures taken periodically conservators or visitors, introducing citizen science strategy.