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← HistoryIn historic pietra dura mosaics subjected to high humidity, which outcome accelerates damage?
A)Hydrolytic weakening of the adhesive✓
B)Thermal expansion mismatch fracturing the stone
C)Galvanic corrosion eroding metal supports
D)Static fatigue creating micro-cracks
💡 Explanation
Hydrolytic weakening accelerates damage because water permeates the organic adhesives bonding the pietra dura to the substrate, enabling hydrolysis reactions that degrade the adhesive's mechanical strength; therefore, the pietra detaches, rather than being caused by stone thermal properties.
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