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terminology

Opalescent glass

1. A type of late 19th-century Art Glass, made by covering a gather of colored glass with a layer of colorless glass containing bone ash and arsenic or the mineral cryolite from Greenland. The parison was inflated in a mold to produce raised decoration. When the parison was reheated, the raised areas became opalescent.
2. A type of glass resembling the iridescent gemstone opal, which was developed by Frederick Carder (1863-1963) at Steuben Glass Works in Corning, New York.

source Corning Museum of Glass

alternate terms

opalescent glass