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← HistoryWhich aesthetic consequence arises when thermal cycling stresses historic pietra dura inlay?
A)Differential expansion loosens stone✓
B)Oxidation darkens metal framework
C)Mortar dissolves from acid rain
D)Dissolution alters the mineral composition
💡 Explanation
Differential thermal expansion causes contrasting stresses; interlayer DEBONDING loosens the fitted stones because each material component has its own Coefficient of Thermal Expansion (CTE). The components shear, therefore adhesion weakens locally, rather than an oxidation/dissolution process affecting structure.
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