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The damage is on the Sout-West wall, ground floor based. It consists of 1cm² large white efflorescence salt extracts.
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Crystallisation and dissolution of salts is caused by wetting and drying. Repeated christalysation and dissoultion cycles affect already porous materials affecting standing structures, archaeology, wall paintings, frescos and other decorated surfaces.
Example: Crusts of salt and black encrustations on walls of the Koules Fortress.
