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Which risk increases when variations in thermal coefficients exist between marble and gemstone components within pietra dura inlay?

A)Increased seismic vulnerability of structure
B)Accelerated decay of mortar substrate
C)Delamination of inlay from substrate
D)Reduced brilliance of polished surfaces

💡 Explanation

Delamination risk increases because the differing expansion rates experienced during heating/cooling cause differential stress concentrating at the glue-stone interface—a process known as thermal stress. Cracking begins, therefore, because bond strength is exceeded, rather than alternative seismic or decay factors.

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