Stacking Glass Method
Stacking glass can help in the creation of bubbles in your fused glass. Any elements that are placed between layers of glass will greatly affect the amount and location of bubbles. This includes glass itself. If the glass is placed where the air can’t escape, a bubble will form. The position, mass and texture of the glass can all influence the quantity and position of desired bubbles.
Leaving open areas and ways for the edges of the glass to seal as it is heated will trap air and make it impossible for it to escape. This can be a very creative way to cause these blisters to be formed inside a fused piece.
As the glass is heated up, the edges and raised pieces will heat up first. This can be used to your advantage in trapping air inside the open pockets. If slowly heating the glass, the air can be pressed out from between these layers by the movement of the shifting glass. If you are trying to trap these blisters, heat up the piece faster. Heating the piece rapidly at about 10 degrees per minute or more will seal the edges before the air is capable of escaping.
When trying to trap air inside your fused piece, notice where you have placed your glass. Check to see that you have created a pocket for the air to become entrapped inside the glass. Make sure that the there is no possible way the glass can shift and allow air to escape.
You can even draw with bubbles by placing the glass in such a manner that internal air pockets are created. Make sure that the edges of your pattern will close before the air can flow and escape.
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Glass Fusing Problems
Stacking Glass Method to Glass Fusing Made Easy