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Which outcome reduces the structural integrity ancient pietra dura?

A)Differential thermal expansion of inlays
B)Grout degradation from acid rain
C)Oxidation darkens softer component minerals
D)Efflorescence salts damage support base

💡 Explanation

Differential thermal expansion leads to separation between inlays and substrate, undermining mechanical interlocking, because stresses from differing expansion rates concentrate along the boundaries therefore losing material over time, rather than uniform degradation across interfaces.

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