Roman ribbed green-blue glass bowl.
27 Ribs, repaired but in good condition and complete.
Price: € 1200,--
Size: 16 x 4,5 cm
Period: c 50 B.C. / 100 AD - Mediterranean
Provenance: German collection PP
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The blue/green tint of this glass bowl comes from a small amount of natural metal in the ingredients.
All sand used for making glass has a very small percentage of metals in it.
Green glass is caused by one to three percent of iron mixed in with the sand.
It is uncertain how much the ancient glassmakers could control the tint of the glass, but they knew which metals caused which colors.