St. Sophia mosaics’ blue color loss involves which mechanism?

💡 Explanation

Phase separation causes loss of vibrancy because the ultramarine pigment’s components separate over centuries, clustering unevenly. This changes light refraction and color appearance; therefore, a muted, patchy tone results; rather than structural failure, degradation affects only pigment.

• What critical risk increased during Inca terrace construction?
• Which risk increased when pre-Columbian Andean civilizations scaled up maize agriculture via terrace farming?
• Within Mughal garden water systems, which outcome occurred if the *nahr* (canal) slope became too shallow?
• Which consequence results when Roman legionaries insufficiently tamp rammed earth layers behind a siege rampart?
• Which limiting factor reduces accuracy when using sextants from small craft?
• During a Roman siege against a walled city, which consequence arises when sappers undermine the wall, creating a void that induces instability?