ANCIENT ROMAN GLASS JAR
Measurements: 7 cm − height, 6.9 cm − width
Description: A Roman pale aubergine glass jar, with a globular, bulbous body and a slightly concaved bottom, short neck and a wide everted rim. The jar has attractive iridescence in green, purple and blue. The word iridescence comes from Iris, the Greek goddess of rainbows and refers to rainbow-like colours seen on glass. It is caused by alkali being leached from the glass by acidic water and then forming fine layers that eventually separate slightly or flake off, causing a prism effect on light bouncing off and passing through the surface which reflects light differently, resulting in a rainbow-like appearance such as the one on this jar.
Reference: The Metropolitan Museum of Art
Period: 3rd - 4th century AD
Condition: Very fine, intact, with earthy encrustations and attractive iridescence over the whole.