Bubbles in Fused Glass – Prevention and Creation

There are so many beautiful creations you can make with a Fuseworks Microwave Kiln. I can honestly say that most of what I have ever made and loved was discovered or created on accident! With that said I can tell you that many of my creations have included tiny bubbles, most of them I didn’t want. I will let you know how to avoid the bubble and how to purposely create them as well.

Accidental bubbles are usually caused by two conditions, pre-existing bubbles in the glass and air becoming trapped during the fusing process unplanned glass movement (especially when the glass is enclosed) and unusual glass placement are usually the culprits here. 

It is hard to rid the bubbles that come from the first condition since they are inherent but the second can definitely be prevented.

If you notice that some of the pieces tend to roll during the fusing process you can deter this by mixing 3 parts water to 1 part glue and adhering the glass together – if you do this, make sure you allow the glue to dry overnight! The other fix is making sure that you do not have a lot of weird overlapping, what I mean is if you are layering two pieces and one piece is larger than the other, make sure that you layer the larger piece on the bottom so air doesn’t get trapped when the pieces fuse.

Now to the good stuff! How can you fuse bubbles on purpose? The answer is a very common household item- Baking soda! Follow the steps below to trap bubbles in glass.

  1. Mix an 80/20 solution of water and baking soda (that’s 80% water 20% baking soda) in a spray bottle.
  2. Spray the base glass with the solution and allow to dry thoroughly and place your top layer over the baking soda layer.
  3. Make sure the top layer is free from any baking soda solution or you will incur a problem called devitrification (or a scummy white discoloration) on the top of your glass.
  4. Fuse for 2 ½ minutes at 80% power for a high watt microwave or 100% for a low watt microwave.

Make sure you swing by the Diamond Tech Creative Corner for more how-to and to download some great fusing projects!

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