In Byzantine mosaics utilizing tesserae with gold leaf on glass, which degradation accelerates if insufficient lime mortar is permeable?

💡 Explanation

Electrolytic corrosion increases due to retained moisture with chlorides creating an electrolyte; ion migration through microcracks causes failures with the gold oxidizing over time. Because the less permeable the mortar, the increased electrolytic corrosion, rather than thermal changes, which would be uniformly distributed.

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