Antique Art Glass developed by J. Couper & Sons of Glasgow c. 1885, and mostly designed by Christopher Dresser. Its name is thought to come from the Gaelic word for the River Clyde. It is usually green, yellow or amber (occasionally turquoise or black), with numerous air bubbles, irregular cloudy streaks and flecks of AVENTURINE.
Found on http://www.antique-marks.com/antique-terms-c.html
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