Which long-term degradation risk uniquely threatens 'pietra dura' in humid environments, such as those found extensively in historical Mughal gardens?

💡 Explanation

Salt crystallization within the 'pietra dura' causes tesserae crumbling because increased humidity accelerates salt transport and deposition within stone's porous microstructure; therefore, damage from salt weathering is amplified, rather than color fading, purely differential expansion, or mere surface obscuration.

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