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← HistoryDuring Mughal construction, which effect could minimize cracking in pietra dura?
A)Use precise thermal expansion matching✓
B)Maximize pigment concentrations in stones
C)Increase the mortar joint thickness
D)Employ larger, fewer stone pieces
💡 Explanation
Cracking minimizes by matching thermal expansion, because differential volumetric changes induce stress exceeding material limits, triggering thermal stress failure. Therefore, matching coefficients reduces stress; rather than increasing pigment (cosmetic), mortar (less force transfer at all) or size (increases surface area). The mechanism is uniform thermal expansion.
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