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Crystal & Non-Crystal Glazes


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#1 DallasGypsy

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Posted 07 July 2012 - 05:41 AM

I have some crystal and non-crystal glazes (cone 5-6) and I'm wondering if pieces that use non-crystal glaze can be fired in the load with the crystal glazes.

My confusion lies in the fact that the crystal glazes usually have a hold time at the end of the firing cycle while the non-crystal glazes don't. Then, some crystal glazes have a slight cool-down and then a hold.

Would this adversely affect the non-crystal glazes? Or can they be fired with the crystal glazed pieces?






#2 Chris Campbell

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Posted 07 July 2012 - 11:52 AM

Are you talking about crystalline glazes with the complicated firing schedule or the commercial glazes that have melting crystals in them?

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#3 Mark C.

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Posted 07 July 2012 - 11:56 AM

Crystalline glazes are fired alone as the firing cycle is lots of hold time as they grow and the glaze runs off the pots into trays that you grind off. Regular glazes will not work well under these conditions.
The whole kiln is a crystalline load.
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#4 DallasGypsy

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Posted 07 July 2012 - 12:53 PM

Thanks for the responses.

The glazes are the type that have the complicated firing schedule so that the crystals are formed during the hold-cooling process. And, I kinda thought that might be detrimental to regular glazes. SO ... crystalline glazes only in the load.

Next is firing schedule. I'm using a Skutt KS-818 with an add-on electronic controller. The kilnsitter has to have a cone in it; so, I generally load a cone 7 and then fire to cone 5 before beginning the first hold. But, somehow, the kiln gets hotter and hotter until the cone melts, shutting off the kiln. I don't get that cooldown-hold part of the programming before the kiln errors out. I'm getting a few crystals but think there would be more if I can get the programming figured out.

Any ideas or suggestions?

#5 bciskepottery

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Posted 07 July 2012 - 09:32 PM

Try Bill Schran's website http://www.creativec...ek_cone6cry.htm

#6 DallasGypsy

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Posted 10 July 2012 - 08:02 AM

Thanks ... Bill's website is awesome!! Has great information. The crystalline glaze effects are beautiful but ... I'm not sure that I want to make the commitment to the firing schedules and the catch pans for runny glaze and grinding the drips.




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