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Which degradation is accelerated in Byzantine mosaics exposed near coastal salt marshes?

A)Tessera detachment and salt efflorescence
B)Oxidation of gold leaf substrate
C)Cement cracking from thermal expansion
D)Fungal colonization of grout lines

💡 Explanation

Salt crystallization within mosaic grout leads to tesserae detachment and surface efflorescence due to osmotic pressure from concentrated salt solutions. This haloclasty arises because the salt solution infiltrates the porous grout, therefore inducing fracturing, rather than chemical oxidation or fungal growth.

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