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Re: [teacherartexchange] Need Help With Ceramics (glazing)

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From: Su Doman (sudoman_at_TeacherArtExchange)
Date: Mon Feb 05 2007 - 17:14:16 PST


On Feb 5, 2007, at 1:20 PM, Rebecca Burch wrote:

> Thanks for the info, Marvin. I'm lucky to have people to ask! How
> did we teach before the Internet? :)
>
> -becky
>
>
> On 2/5/07, Marvin Bartel <marvinpb@goshen.edu> wrote:
>> >Hi, all.
>> >I am REALLY new to ceramics but am really enjoying teaching and
>> >learning along with my students.
>> >
>> >So here's my question -- if a student has a piece that has already
>> >glaze-fired, and she forgot to use the clear glaze on top, can she
>> >re-glaze it and then glaze fire it again?
>> >
>> >Thanks
>> >Becky
>>
>> In most cases this works fine.
>>
>> If the glaze firing has left the clay harder and less porous, you
>> have to try harder to get enough glaze thickness. If this is a
>> problem, use a thicker glaze mix or heat the piece a bit for glazing.
>> I thicken glaze by pouring off the top water before stirring it
>> (then pour the same water back in when finished). In rare cases where
>> the piece has been fired to stoneware temperatures such as cone 6,
>> the piece explodes if it is re-glazed and fired before all the
>> glazing moisture has been dried out. This is probably not a problem
>> for the cone 06, 05, and 04 glaze firings.
>>
>> Marvin
>>
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