Don & June MacDonald on fri 3 nov 00
Don't fire a penny either (1 cent coin)! It ate through the pot,
through the shelf and dripped on the bricks at the bottom of the kiln.
June from B.C.
amy parker wrote:
>
> Jim - as always, "it depends" on the crystals. We have a bunch of poor
> grade emeralds from NC that I fired in my "I'll fire anything once" days.
> They turned a really sickly yellow - they were green but not terribly clear
> before - and they fractured. Amethyst lost all of its color - also
> fractured. Your student should test with some inexpensive samples and see
> what happens.
>
> Do NOT fire copper chunks!!!! They flux like crazy - ate thru the test cup
> and half way thru the kiln shelf!
>
> Amy
>
> At 02:56 AM 11/3/00 GMT, you wrote:
> >Hi all, Has anyone ever fired a crystal with clay? A student of mine wants
> >to put crystals in/on his bowls and fire them. I've never thought about
> >firing a crystal before. We fire to cone 6 in an electric kiln. Any thoughts
> >on what might happen? Jim
> >_________________________________________________________________________
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> >
> Amy Parker
> Lithonia, GA
>
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Jim Bozeman on fri 3 nov 00
Hi all, Has anyone ever fired a crystal with clay? A student of mine wants
to put crystals in/on his bowls and fire them. I've never thought about
firing a crystal before. We fire to cone 6 in an electric kiln. Any thoughts
on what might happen? Jim
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amy parker on fri 3 nov 00
Jim - as always, "it depends" on the crystals. We have a bunch of poor
grade emeralds from NC that I fired in my "I'll fire anything once" days.
They turned a really sickly yellow - they were green but not terribly clear
before - and they fractured. Amethyst lost all of its color - also
fractured. Your student should test with some inexpensive samples and see
what happens.
Do NOT fire copper chunks!!!! They flux like crazy - ate thru the test cup
and half way thru the kiln shelf!
Amy
At 02:56 AM 11/3/00 GMT, you wrote:
>Hi all, Has anyone ever fired a crystal with clay? A student of mine wants
>to put crystals in/on his bowls and fire them. I've never thought about
>firing a crystal before. We fire to cone 6 in an electric kiln. Any thoughts
>on what might happen? Jim
>_________________________________________________________________________
>Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
>
>Share information about yourself, create your own public profile at
>http://profiles.msn.com.
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
>
Amy Parker
Lithonia, GA
Judy Kanigel on fri 3 nov 00
Jim,
Have you ever fired marbles or broken pieces of colored glass? Inside a
bowl or plate, they will melt and form a glaze puddle,I think at about 2000
degrees.
Years ago I did low fire projects with elementary students using three or
four different colors and the kids loved the results. Some words of caution-
too many marbles or too much glass will make it too thick, and cool slowly
(without peeking) until the kiln is cold. Otherwise it can craze like
crazy.
Judy in Cambridge
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of amy parker
> Sent: Friday, November 03, 2000 8:06 AM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Re: Firing crystals?
>
>
> Jim - as always, "it depends" on the crystals. We have a bunch of poor
> grade emeralds from NC that I fired in my "I'll fire anything once" days.
> They turned a really sickly yellow - they were green but not
> terribly clear
> before - and they fractured. Amethyst lost all of its color - also
> fractured. Your student should test with some inexpensive samples and see
> what happens.
>
> Do NOT fire copper chunks!!!! They flux like crazy - ate thru the test cup
> and half way thru the kiln shelf!
>
> Amy
>
> At 02:56 AM 11/3/00 GMT, you wrote:
> >Hi all, Has anyone ever fired a crystal with clay? A student of
> mine wants
> >to put crystals in/on his bowls and fire them. I've never thought about
> >firing a crystal before. We fire to cone 6 in an electric kiln.
> Any thoughts
> >on what might happen? Jim
> >_________________________________________________________________________
> >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
> >
> >Share information about yourself, create your own public profile at
> >http://profiles.msn.com.
> >
> >_________________________________________________________________
> __________
> ___
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
> >
> >
> Amy Parker
> Lithonia, GA
>
> __________________________________________________________________
> ____________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
Bruce Girrell on fri 3 nov 00
Jim Bozeman wrote:
>Has anyone ever fired a crystal with clay?
As you might guess, it's going to depend on the crystal. If it's a feldspar
crystal, it might melt. If it's a pyrite crystal, it will decompose. If it's
a quartz crystal, it won't melt, but it might fracture.
I'll assume that you are dealing with quartz-based crystals. I'd be most
concerned about fractures. Because of their extremely orderly structure,
crystals have cleavage planes within them that make them very susceptible to
cracking when subjected to stresses. I'd recommend very slow temperature
gradients, both firing and cooling, to minimize the chances of fracturing.
Go especially slowly through the quartz inversions. Also, don't use your
prettiest crystals on the first attempt.
Good luck. Let us know how it turns out.
Bruce "rockhound since I was old enough to pick them up" Girrell
Snail Scott on fri 3 nov 00
A crystal of what? Quartz? That's silica, after all.
Pretty high melting point, if it's not ground tiny and
fluxed by something else. Fairly resistant to thermal
shock, too, I would think. Probably not much would happen.
If he wants the look of a crystal embedded in the clay,
he will need to allow for the shrinkage of the clay around
it. Same if he adds it afer firing, but maybe less wear
and tear on the crystal.
Might as well try it once, I guess!
-Snail
At 02:56 AM 11/3/00 GMT, you wrote:
>Hi all, Has anyone ever fired a crystal with clay? A student of mine wants
>to put crystals in/on his bowls and fire them. I've never thought about
>firing a crystal before. We fire to cone 6 in an electric kiln. Any thoughts
>on what might happen? Jim
>_________________________________________________________________________
>Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
>
>Share information about yourself, create your own public profile at
>http://profiles.msn.com.
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
Gabrielle on fri 3 nov 00
Well Jim, I'm pretty sure that at ^6 the crystals would either
explode or melt. I could be wrong, but I fired crystals at 06 ox.
and they came out white.....It would be worth testing though, because
the crystals I experimented with did appear fractured before firing,
and after firing they seemed completely white, (opaque).
Gabrielle
In clayart@egroups.com, Jim Bozeman wrote:
Hi all, Has anyone ever fired a crystal with clay? A student of mine
wants
to put crystals in/on his bowls and fire them. I've never thought
about
firing a crystal before. We fire to cone 6 in an electric kiln. Any
thoughts
on what might happen? Jim
______________________________________________________________________
___
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http://www.hotmail.com.
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______________________________________________________________________
________
Send postings to clayart@l...
You may look at the archives for the list or change your subscription
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Moderator of the list is Mel Jacobson who may be reached at
melpots@p...
--- End forwarded message ---
tgschs10 on sun 5 nov 00
You wrote:
Do NOT fire copper chunks!!!! They flux like crazy - ate thru the test cup
and half way thru the kiln shelf!
I had a metal worker give me a bunch of copper shavings; these produced very
lovely results when fired in oxidation or reduction producing lovely green
or red speckles with a clear glaze at cone 10; of course these were not
"chunks"
Tom Sawyer
tgschs10@msn.com
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