Within Mughal gardens employing intricate 'pietra dura', which risk escalates disproportionately when unfiltered river water feeds the fountain system?

💡 Explanation

Hard particulates in unfiltered water abrade delicate 'pietra dura' inlay because erosion amplifies light scattering (Tyndall effect); therefore, discoloration rapidly increases, rather than merely incrementing algae or general material erosion evenly across the system.

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