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Boiled Glass

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Re: Boiled Glass

Postby marykaynitchie » Mon Sep 10, 2018 9:15 am

Hi Sheri,

Sorry for the delay in getting some advice for you. The process should work at 1650 degrees F, and we would expect it to take longer. Monitor frequently throughout the process temperature.

Mary Kay
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Bullseye Glass Co.

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Re: Boiled Glass

Postby mahle.linda » Tue Oct 30, 2018 9:04 am

I just finished my first attempt at boiled glass. I made a 5" x 5" square. It cracked across the piece and one side basically crumbled. I used the published schedule, with a 1:30 hold at 1700, and I extended the anneal hold at 900 to 2:30. I used Red and Spring Green Opalescent. Any ideas what went wrong? The bottom rainbow irid layer also really stuck to the kiln wash.
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Re: Boiled Glass

Postby marykaynitchie » Wed Oct 31, 2018 11:21 am

Wow, that kiln wash really stuck! What kind was it?
Also, it seems very odd that the sticking happened with an iridzed sheet--are you completely sure that the iridescent side was down against the shelf?

Mary Kay
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Bullseye Glass Co.

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Re: Boiled Glass

Postby mahle.linda » Fri Nov 02, 2018 9:53 am

Yes, the kiln wash really stuck. I soaked the pieces in vinegar for quite a long time and could barely scrub it off. It was Bullseye kiln wash. I am not 100% sure that I had the irridized side down, as I realized I couldn't tell for sure. I presumed the side with the info sticker was the irridized side, so that is the side I put down. How can I be sure about the irridized side next time?

Do you think that caused the major cracking? Thanks for your input.
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Re: Boiled Glass

Postby jestersbaubles » Fri Nov 09, 2018 8:41 pm

You can feel the coating on the iridized side. Also, much like dichro, if you put a pencil point on the surface, on the side with the irid you do not see a space between the pencil and the pencil reflection, but on the non-irid side, you do.

Red glass does not do well at high temps -- this may be part of the problem.

Best, Dana
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Re: Boiled Glass

Postby mahle.linda » Sat Nov 10, 2018 8:12 am

Thank you, Dana. I tried the pencil test, but I guess I didn’t try hard enough. I will give it another shot.
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