I never intended to slump wine bottles then I agreed to do a few for some friends. It hasn't gone perfectly and you know me. That's a challenge flag and I'm determined to meet it. So I went to the local wine bar and got a case of bottles and set out to try to figure this process out.
Here's an early lesson. A bottle stuck to this mold and I thought it was because I had not covered the mold thoroughly with the release agent.
One mold ruined.
I was wrong! The problem was slumping bottles with paint on them. Some bottles have painted labels and they are cool to slump because the paint generally stays on. But now I know that the bottle can't have paint on the side against the mold because the paint sticks permanently.
I bought a new mold and started futzing with the slumping program to find out what was causing the devitrification.....that hazy look. I experimented a lot but eventually gave up on that program and started all over with the program from my favorite fused glass book.
One success was all I needed to keep going.
More bottles and as many different results but I have learned what part of the program was causing the problem and I think I have it adjusted as much as possible. I've accepted that bottles just misbehave. One way to deal with that is to spray the bottle with devitrification spray before slumping. That basically covers it with clear glass powder and that hides/prevents the devitrification.
That works! This is a really thick bottle so I knew it would be a problem. The spray prevented it.
Except that you can only spray the exposed surface of the glass. The part against the mold can't be sprayed. When some drips to the back it sticks to the mold.
Another lesson learned.
Now I was ready to tackle the one piece that I wanted to do for my friend for Christmas. She got married last summer and I secretly took her empty wedding champagne bottle to slump. I slumped it flat and it devitrified. I thought I might be able to fix it with the spray and just re-slump it.
New fusing term: thermal shock.
Thermal shock occurs when the heating or cooling is too fast. This one broke during the heating up phase. It broke with enough force that it separated itself this much in the kiln.
This is why. I didn't take into consideration that the glass is twice a s thick now.
So Anne got a story for Christmas instead of her wedding champagne bottle.
I'm not done! I bought more molds and
picked up more bottles from the wine bar.