Analysis reveals the relationship between soluble salts and painting deterioration in cave murals, indicating significant preservation implications.
Blister is a type of deterioration of wall paintings in Cave 351 of the Mogao Grottoes. The components of the blister identified as NaCl by EDS and XRD. An analysis of soluble salts in the plaster layer of Cave 351 showed that there was a close connection between the distribution of soluble salts and blister. Moreover, each soluble ion had a different distribution character in the plaster layer. External water which was used for consolidating plaster or infiltration from rock brought soluble salts (NaCl mainly) into the plaster layer, and then, when the water was vaporized, the crystalloid NaCl caused the blister deterioration.
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Chen et al. (2013) studied this question.
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