Cluthra glass

A type of art glass characterized by large air bubbles of various sizes combined with larger unsifted glass particles, and cased with heavier clear glass. Cluthra glassware is made from a lump of crystal glass on a blowing iron, which is rolled across a marver that had been sprinkled with powdered glass of any desired color. It was developed at Steuben Glass Works before 1930 as a variation on the very similar Clutha glass.