Which degradation outcome was accelerated because moisture entered Roman mosaics?

💡 Explanation

Tesserae dislodgement risk increased noticeably because the capillary action of penetrated moisture facilitated salt crystallization in the gaps, exerting outward pressure via 'salt weathering'; therefore, tesserae popped out, rather than pigment fading or mortar weakening which occurred more slowly in drier sites.

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