1. 
   Cluthra glass
   Cloudy, bubbly art glass developed in the USA by the British designer Frederick carder. The effect was created by adding saltpetre (potassium nitrate) to the molten glass; the chemical reacts with the heat to form the large, random bubbles. Cluthra glass is cased with an outer layer of heavy, clear ...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   cluthra-glass
   Cloudy, bubbly art glass developed in the USA by the British designer Frederick Carder. The effect was created by adding saltpetre (potassium nitrate) to the molten glass; the chemical reacts with the heat to form the large, random bubbles. Cluthra glass is cased with an outer layer of heavy, clear ...
   Found op http://www.antique-marks.com/antique-terms-c.html
   
   

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