Which mechanism diminished the early brilliance of Mughal-era pietra dura inlays featuring malachite?

💡 Explanation

The green color of malachite (copper carbonate hydroxide) can be masked by oxidation of iron sulfide inclusions, forming brownish iron oxides because the oxidation reaction changes the material's crystal structure. Therefore, the inlay appears duller, rather than from etching corrosion or phase changes.

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