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Which consequence results from thermal shock on a Byzantine mosaic?

A)Tesserae spallation and detachment
B)Oxalic acid layer formation
C)Grout efflorescence and cracking
D)Gold leaf sublimation and loss

💡 Explanation

Tesserae spallation and detachment occurs because differential thermal expansion introduces stress exceeding the material strength, leading to fracture and loss of adhesion; therefore, spallation happens, rather than sublimation, which would require vaporizing the material.

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