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← HistoryWhich outcome reduces aesthetic value due to sulfur exposure on sandstone containing embedded pietra dura?
A)Gypsum formation causes surface blistering✓
B)Iron oxidation darkens the tesserae
C)Carbonation increases compressive resistance
D)Silica dissolution preserves surface luster
💡 Explanation
Gypsum formation results in surface damage because acid rain containing sulfur dioxide reacts with the calcium carbonate in sandstone, causing a sulfation reaction that produces gypsum; therefore, blistering occurs rather than oxidation or dissolution that require different environmental contexts.
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