Abstract

Abstract Preliminary measurements have indicated that the coaxial probe technique in the microwave region may prove to be useful for monitoring conservation treatment of paintings. Measurements were performed on a number of cleaning agents, natural glue samples, paint films, primed canvas samples during deacidification processes and localised moisture treatment, and paintings undergoing humidification using a suction table. The effect of localised moisture treatment was also studied on samples of both recent and nineteenth century oil‐based priming, recent priming which had been wax‐lined, and then acrylic based priming. Results show that the probe is sensitive to the increasing or decreasing presence of small polar molecules (eg water, methanol) with time.

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