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← HistoryWhich risk increases during the creation of pietra dura inlay when malachite or lapis lazuli pieces exceed thickness constraints?
A)Adhesive layer tensile cracking✓
B)Differential thermal expansion
C)Mortar desiccation volumetric strain
D)Substrate hygroscopic material swelling
💡 Explanation
Adhesive layer tensile cracking is more likely because constrained thicker stone pieces cause higher stress concentrations during normal fluctuations in the ambient conditions; stress overtops the epoxy's strength rather than causing expansion, therefore the adhesive fails.
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