1. 
   opalescent glass
   1A specific type of iridescent glass developed by the British glass-maker Frederick carder for the steuben glassworks in the USA. Its appearance, similar to that of a natural opal, was created by cooling the glass object with compressed air and then reheating it. The glass was produced in pink, blue...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   opalescent-glass
   Its appearance, similar to that of a natural opal, was created by cooling the glass object with compressed air and then reheating it. The glass was produced in pink, blue, yellow and green.
   Found op http://www.antique-marks.com/antique-terms-o.html
   
   

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