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Abstract Soluble salts are a major threat to historical wall paintings, yet the response of pigment layers to salt exposure remains unclear. In this study, cinnabar (HgS) and red lead (Pb3O4) mock-ups were treated with graded salt concentrations, artificially aged, and characterized by complementary techniques. The pigment layers showed distinct deterioration thresholds and pathways.
ABSTRACT The degradation of cinnabar and red lead paint layers under light exposure poses a critical challenge to the long-term preservation of historical wall paintings. Understanding the light-induced degradation processes is essential for regulating light environments and mitigating risks to cultural heritage. However, the intrinsic relationship between the degradation processes of cinnabar and red lead paint layers and light intensity remains unclear.
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