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Which 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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