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glazing at different temps

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#1 druttaro



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Posted 05 February 2013 - 12:20 PM

I am making a bowl and want to apply glaze at cone 10 only on the inner surface, then refire it at cone 5 with underglaze for vibrant colors. Is this even possible? Will the inner glaze be damaged? Any help is welcomed!

#2 Marcia Selsor

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Posted 05 February 2013 - 01:46 PM

Yes it is possible but be careful that you don't shock the matured/vitrified clay on the second glaze firing. you may have a tricky time getting the ^5 glaze to stick after the ^10 firing but it is possible. You can get brighter colors at ^10 if you use encapsulated stains. That could save you the hassle of 2 glaze firings and struggling with glaze application on a vitrified body.

Marcia Selsor, Professor Emerita,Montana State University-Billings

#3 neilestrick


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Posted 05 February 2013 - 02:14 PM

There's also a decent chance that the cone 10 glaze will change in the cone 5 firing- color shift, glossiness change, etc. Test it first.

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#4 druttaro



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Posted 05 February 2013 - 02:33 PM

Thanks for the replies.

I do have a test piece drying but wanted to see if it was even possible. I am not to concerned with color change to the ^10 glaze but don't want it to change texture.

I am doing sugar skulls so will be happiest with good color on the outside.

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#5 bciskepottery


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Posted 05 February 2013 - 03:18 PM

Something to think about . . . why not use a cone 5/6 claybody, glaze fire to cone 6 and apply the underglazes for the same fire? I am assuming your underglazes are for the sprigs attached to the outside of the bowl. Save yourself time and the cost of the extra firing.

#6 Mark C.

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Posted 05 February 2013 - 04:25 PM

I am a cone guy-and most glazes will change somewhat when fired again to lower temp. That is a shiny glaze can become matt etc.
I am with Marcia on the cone 6 all the way body-
Testing is the only way to know any of this as you are in unchartered territory.
Mark Cortright

#7 druttaro



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Posted 06 February 2013 - 07:11 PM

I am taking a class at my university and have to use the clay available.

#8 Lucille Oka

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Posted 06 February 2013 - 09:57 PM

Why must you do this, are these the only glazes available to you?

John 3:16
"For God so loved the world that He gave His only begotten Son, that whosoever believeth in Him should not perish but have everlasting life".

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