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.

• Which algebraic approach employed in ancient surveying could mitigate cumulative errors over long distances?
• Which eventual consequence occurred as the Floating Chinampa gardens of Tenochtitlan experienced increased urban crop demand?
• Which soil degradation risk increases when poorly designed Inca agricultural terraces experience heavy rainfall?
• Which outcome occurred when Greek fire projectors experienced clogging during naval battles?
• Which risk increased when Bronze Age smiths repeatedly cold-worked bronze armor?
• Which risk increased for Byzantine defenders whenever trebuchet range shortened on siege?