Opalescent Glass

The term "opalescent glass" is commonly used to describe glass where more than one color is present, being fused during the manufacture, as against "flashed" glass in which two colors may be laminated, or silver stained glass where a solution of silver nitrate is superficially applied, turning red glass to orange and blue glass to green. Some opalescent glass was used by several stained glass studios in England from the 1860s and 1870s onwards, notably Heaton, Butler and Bayne. Its use became increasingly common. Opalescent glass is the basis for the range of glasses created by Tiffany.

More attractive pieces of opalescent glass were turned out by the Dugan Diamond Company and H. Northwood. These consisted of lines of pressed glass known as "Intaglio" and paint decorated opalescent glass. These pieces are the most highly valued items collectors seek today. There are also decorated milk glass objects to be found, a number of which were produced by the Westmorland Specialty Company.

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