Help with controlled bubbles?

[Obim]

Hi peeps,

I'm looking for some advice on how to acheive a degree of "controlled" bubbles through a fused piece to give surface texture. I'm not looking at a regualr pattern but an array of bubbles from 1mm say up to 10mm in diameter scatterred across the fused piece.  I understand that copper oxide may be the solution? But where do I purchace it and in what format and quantity do I apply it?  Can I create my own from copper filings?  Any advise would be much appreciated

Obim

[bluefairy]

The only thing with copper oxide is it will also give you colour, ie turquoise bubbles.  Maybe best off sticking with good old common or garden bicarb sifted evenly over your glass, mind you don't have any big piles off the stuff though or you'll end up with HOOOOOOGE  bubbles that might be a little on the unstable side!! 

[Redhotsal]

Yes, it's really easy to overdo the bicarb (speaks from personal experience!) 

Have you considered fusing together two pieces of glass in which one piece is flat and the other  has a textured surface? As they fuse together air bubbles will be trapped between the pattern. More info here:
http://www.glass-fusing-made-easy.com/textured-design.html