Chapter III · Luminance
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Quality endures where commerce fades

Glazing Endurance Index
Comparative light retention scores across eight centuries
100 80 60 40 20 0 94 87 82 61 43 28 17 Chartres Murano Rheinland Georgian Victorian Modern Laminated c. 1200 c. 1450 c. 1180 c. 1780 c. 1870 c. 1960 c. 2005
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