2 questions, #1 about Spray A #2 problems with kiln shelf - WarmGlass.com

2 questions, #1 about Spray A #2 problems with kiln shelf

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Linda Hassur
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Joined: Sat Mar 15, 2003 10:40 pm

2 questions, #1 about Spray A #2 problems with kiln shelf

Postby Linda Hassur » Tue Jan 13, 2004 7:15 pm

#1 I was working with BE 0137 French Vanilla and used Spray A on it. It turned a ugly yellow color. I know that this particular glass causes problems with interactions to other glasses. I'm assuming that this is the reason I had the problem.

#2 I have a kiln shelf that has one area that won't accept kiln wash. I also have a slumper mold with the same problem. I've used sandpaper and some other methods of trying to "scuff" up the surface but these areas are "slick" and won't accept the kiln wash. I don't have a sand blaster but is there any other thing I can try? Thanks Linda

Bob
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Joined: Mon Mar 10, 2003 1:01 pm
Location: Salt Spring Island, British Columbia
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Postby Bob » Tue Jan 13, 2004 7:35 pm

Hi Linda,

The Lead in the overglaze reacts with something (sulphur?) in the French Vanilla to create the muddy colour .... at least that is what I believe the reaction to be. Someone please correct me if I'm wrong. Nonetheless it is a chemical reaction of some sort.

I think the only cure for the impermeable shelves/moulds is probably sandblasting. Go to a body shop, or find a place through the yellow pages that will rent you time on a sandblaster.

Hope this helps.

Cheers,

Bob

Barbara Muth
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Joined: Sun Mar 09, 2003 8:10 pm
Location: Washington DC Metropolitan Area
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Postby Barbara Muth » Tue Jan 13, 2004 8:24 pm

Bob wrote:
The Lead in the overglaze reacts with something (sulphur?) in the French Vanilla to create the muddy colour .... at least that is what I believe the reaction to be. Someone please correct me if I'm wrong. Nonetheless it is a chemical reaction of some sort.

Bob


ding ding ding. I think you nailed that one right on the head Bob.

Incidentally, French Vanilla is not the only glass with sulphur, there are other glasses with similar reactions to those of French Vanilla. Ah the joy of color reactions.....

Barbara
Barbara
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