by Tom Gaskell
•
28 February 2021
I have been doing a lot more work on 'dropouts' recently. Dropouts are where you fuse a VERY thick (20-25mm) sheet of glass (which takes a LONG time to make - over 24 hours in the kiln to anneal the glass and stop it shattering, as it's so thick), then hold it up in the kiln on a ceramic donut and let it 'drip' through the hole. It's very expensive as you throw away over half the glass (or recycle it where possible, of course). Timing is critical, as if you stop the drip too soon you end up with a rounded half-hearted, rounded-bottom thing that is not very usable, and if you leave it too late you get a mess in the bottom of the kiln. Design is critical too, as the glass stretches so much. The glass that ends up on the bottom of the vase/drinking glass is pretty-well 'as is', the way you design it, but the upper parts of the item are stretched by up to twenty times - bubbles become long streaks and opaque glass becomes transparent, but it only applies to a very small area of the original, thick blank. You need to cut the 'drip' from the blank. I am told you can do it with a sharp glass cutter and a hammer, but get it wrong and you can lose a few tens of ££ of glass in an instant. So I take a little longer and use a diamond cutting wheel in a water bath. Then you grind and polish the top edge which can take anything from about 15 minutes to an hour. As if that wasn't enough, the thickness is critical and difficult to control. Too thick and it's ugly and clunky, too thin and it shatters as soon as you try to polish the upper edge. So if you ever wondered why fused glass vases and the like cost so much, I have just given you a few clues! But they are fun to do in a slightly scary 'will it or won't it' way and the end result can be very satisfying.