Which primary consequence arose when improperly prepared tesserae mortar reacted chemically in early Byzantine mosaics?

💡 Explanation

Decreased structural longevity resulted from mortar degradation, primarily through ALKALI-SILICA REACTION. This reaction caused mortar expansion, leading to tesserae dislodgement because of differential material properties, therefore reducing the mosaics' lifespan, rather than benefiting aesthetic or cost factors.

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