Columbia subject headings:
Glass manufacture--Chemistry--History.
Glass--Analysis.
Mosaics, Byzantine--Analysis.
Harvard subject headings:
Basilica di S. Vitale (Ravenna, Italy)
Colors--Analysis.
Glass manufacture--Chemistry--History.
Glass--Analysis
Mosaics, Byzantine--Analysis.
Mosaics--Technique
Princeton subject headings:
Color in art.
Mosaics, Byzantine.