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Which unintended consequence was observed across centuries in Mughal monuments due to unanalyzed properties of marble?

A)Structural collapse from induced vibration
B)Pitting corrosion from sulfuric acid
C)Biogenic staining catalyzed by pietra
D)Differential discoloration caused by thermal cycling

💡 Explanation

Biogenic staining was frequent within marble structures using pietra dura, because moisture enabled microbial sulfur oxidation within inlaid organic materials thereby causing mineral staining. Therefore, unsightly discoloration spread outwards rather than structural weakening.

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