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← HistoryWhich long-term risk appeared within Byzantine mosaics after prolonged heat exposure?
A)Tesserae discoloration due to annealing
B)Substrate cracking from thermal expansion✓
C)Grout erosion via alkaline hydrolysis
D)Gold leaf sublimation and delamination
💡 Explanation
Substrate expansion causes cracking because differing thermal expansion rates between it and in the tesserae produce stresses exceeding material strength in the binding agents. Therefore option B is correct, rather than the other options, which affect the facing not necessarily the structural integrity.
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