Microclimate Indoor Monitoring for the Preservation of Organic-Based Cultural Heritage

This paper examines the use of organic-based materials to monitor levels of corrosivity in indoor microclimate environments, which include proximity to artworks, artworks in display cases, and, in particular, in microclimate frames for paintings. It reviews research conducted within four EU-funded projects: Environmental Research for Art Preservation (ERA), Microclimate Indoor Monitoring in Cultural Heritage Preservation (MIMIC), Improved Protection of Paintings during Exhibition and Storage (PROPAINT), and Measurement, Effect Assessment, and Mitigation of Pollutant Impact on Movable Cultural Assets—Innovative Research for Market Transfer (MEMORI). The ERA project introduced the use of egg tempera paint dosimeters to assess levels of corrosivity in proximity to artworks. A multi-analytical approach was employed to evaluate chemical changes in the dosimeters, enabling risk assessment, exemplified by samples exposed at Sandham Memorial Chapel, Hampshire, UK. Building on this, in the MIMIC project, coated piezoelectric quartz crystals (egg tempera and resin mastic), a varnish commonly used by artists, were exposed at a number of sites together with the same coatings on steel strips. These were further employed in the PROPAINT project together with some continuous monitoring prototypes to investigate the nature of microclimates both within specially designed mc-paint frames and in the surrounding room environments. This paper presents Fourier Transform Infrared Spectroscopy (FTIR) and Dynamic Mechanical Analysis (DMA) from these exposures, together with environmental data recorded during the monitoring period and information on frame types used. Some correlation was found between FTIR, DMA, and environmental data. The findings reveal that changes in the physico–chemical properties measured by the techniques correlate with the environmental conditions. It also points to the possibility of using FTIR to monitor chemical changes in exposed coated strips. Additional data from the MEMORI project of similar exposures but including dammar and Regalrez 1094 varnish are also presented.