Last Updated: Oct 06, 2016 Views: 39
I attached pages from the following books that address bubbles in fused glass:
Culler, Rene. Glass from the Kiln. Atglen, PA: Schiffer, 2010.
Walker, Brad. Contemporary Warm Glass.... Clemmons, NC: Four Corners Intern'l, 2002 rev.ed.
Watkins-Baker. Kiln Forming Glass. Ramsbury, Marlborough: Crowood Press, 2010.
They contain basic information about avoiding bubbles and devitrification, plus a few ideas on using temperature and other means to create bubbles.
I also attached a list of websites and articles that address creating bubbles, many using the techniques you have tried, but I hope they include more detailed information to help you refine the techniques.
Sites, like these, that describe various techniques for eliminating bubbles -- perhaps you could experiment with adding (instead of eliminating) bubbles using these ideas:
There are additional websites listed in the attachment.
Using powder or frit of various grain sizes can cause bubbles to form between the grains. (pate de verre, from powders, can appear opaque due to fine bubbles). Walker and other sources address the use of powders and frit.
Glassblowers also add bubbles to their glass, for example:
http://www.glassfacts.info/index3c68.html?fid=192 (this technique was used extensively by Napoleone Martinuzzi and Seguso Vetri d'Arte Murano-Venezia, Italy in glassblowing)
and Frederick Carder's Steuben glass -- I attached a scan from Gardner, Paul. The glass of Frederick Carder. NY: Crown Publishers, 1971 that describes his bubbly techniques.
Let me know if you would like more information about these types of glasses.
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Please let me know if I can help you again. Good luck with your experiments.