Laboratory test on moisture adsorption-desorption of wall paintings at Mogao Grottoes, China

Research on the Mogao Caves reveals that moisture desorption from wall paintings occurs significantly faster than adsorption, suggesting strategies to mitigate deterioration caused by visitor breath and seasonal humidity fluctuations. The study used simulated mural plaster specimens exposed to controlled relative humidity (RH) and air temperatures (ATs), with weight measurements tracking moisture changes over time. Findings indicate that frequent cave openings during humid seasons should be avoided to prevent continuous wetting of wall paintings, while limiting visitor exposure in high-humidity conditions could reduce adverse effects.

Zhang, H.-y., Yan, G.-s., & Wang, X.-d. (2012). Laboratory test on moisture adsorption-desorption of wall paintings at Mogao Grottoes, China. Journal of Zhejiang University SCIENCE A, 13(3), 208–218. https://doi.org/10.1631/jzus.a1100204