logan johnson on sun 9 apr 06
After checking the archives my hubby Dennis has decided to bisque his terra sig. pieces at ^010 does this sound right?
Thanks,
Logan
Logan Johnson
Yakima Valley Pottery & Supply
719 W Nob Hill Blvd. Ste C
Yakima, WA 98902
509.469.6966
www.audeostudios.com
"Carpe Argillam!!"
logan johnson on mon 10 apr 06
Hi Vince,
Thanks for writing back. BTW, Dennis got the ^010 temp from your post in the archives but I wasn't sure if that temp was for your method exclusevly or could it be used as a general rule of thumb. He used a pad made from a pair of my new nylons
(I need to talk to the boy about picking the expensive ones) to polish the terra sig. He plans to try horse hair raku on the piece. The terra sig recipe came from the James Watkins book Alternative kilns & firing methods. We want the pot to be as shiny as possible. I burnished the piece to a lovely high gloss on the wheel before he applied the terra sig then he just polished the pot with the nylon pad. I guess unless you tell me different we'll bisque at ^010.
Thanks for the reply!
Logan
Vince Pitelka wrote:
Logan -
There's no clear answer. It all depends on what your intentions are and
what kind of effect you want. If you have burnished the terra sig, then you
shouldn't fire any higher than cone 016 or 014. If you have polished the
terra sig with a piece of plastic or a soft cloth, then you can fire it as
high as cone 02 with only slight loss of shine. You can fire higher than
that, with some loss of shine. The shine inevitably diminishes as you fire
to higher temperatures, but much of that depends on the clay you have used
for your terra sig. Needless to say, a terra sig made from red earthenware
clay will turn to a glaze at highfire temperatures. Also, when you fire to
higher temperatures there is a greater chance that your terra sigs will chip
and flake.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
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Logan Johnson
Yakima Valley Pottery & Supply
719 W Nob Hill Blvd. Ste C
Yakima, WA 98902
509.469.6966
www.audeostudios.com
"Carpe Argillam!!"
Vince Pitelka on mon 10 apr 06
Logan Johnson wrote:
"After checking the archives my hubby Dennis has decided to bisque his terra
sig. pieces at ^010 does this sound right?"
Logan -
There's no clear answer. It all depends on what your intentions are and
what kind of effect you want. If you have burnished the terra sig, then you
shouldn't fire any higher than cone 016 or 014. If you have polished the
terra sig with a piece of plastic or a soft cloth, then you can fire it as
high as cone 02 with only slight loss of shine. You can fire higher than
that, with some loss of shine. The shine inevitably diminishes as you fire
to higher temperatures, but much of that depends on the clay you have used
for your terra sig. Needless to say, a terra sig made from red earthenware
clay will turn to a glaze at highfire temperatures. Also, when you fire to
higher temperatures there is a greater chance that your terra sigs will chip
and flake.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
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