1. 
   crizzling
   Fine network of cracks in glass caused by excess alkali in the ingredients. This problem was largely overcome by George ravenscroft in 1676 when he added lead oxide to the metal.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   crizzling
   Fine network of cracks in glass caused by excess alkali in the ingredients. This problem was largely overcome by George ravenscroft in 1676 when he added lead oxide to the metal.
   Found op http://www.antique-marks.com/antique-terms-c.html
   
   

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