Is it possible to modify a commercial cone 6 glaze so it can be single fired?      I have Standard brand glazes and clay, all of it cone 6.

 

Thanks :)

 

Liz

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Single firing continues where the bisque firing stops; cone 6 glazes don't mature at bisque temperatures. In other words, it's a straight drive from bisque into the glaze firing, without cool down. I haven't found it necessary to modify commercial glazes for single firing.

I was under the impression that single fire glazes need a high clay content to prevent any issues.      I will give it a shot, thanks :)
 
Victoria Cochran said:

Single firing continues where the bisque firing stops; cone 6 glazes don't mature at bisque temperatures. In other words, it's a straight drive from bisque into the glaze firing, without cool down. I haven't found it necessary to modify commercial glazes for single firing.

Virtually all of my work is single fired, now. Many, not all, with commercial glazes--

http://www.flickr.com/photos/la_vika/sets/72157613501070609/

If one is only doing small pieces like the buttons ( I only took a quick look of what Victoria may be doing) then it would not be an issue.

Applying a glaze to green ware is going to need consideration of adding moisture to the dry clay, and shrinkage issues when drying. Often a higher clay content helps...so that the glaze shrinks along with the clay.

With commercial glazes, I would not bother to ask for advice but to try it and test.... and each glaze will give you its own problems, or should I say, queries?. Too many variables...just go for it and see what happens!

Thanks, Maggie...didn't think.
When doing larger/thicker (tiles and small bowls), I usually glaze at leather hard.

Hi Liz,

I have pictures and descriptions of several pots I single fired using commercial glazes here:

http://cone6pots.ning.com/photo/albums/single-fired-work

It was somewhat a step into the unknown and I did not have any issues at all.  I am kind of an all in potter, but test tiles would tell you how your glazes would work in single firing.  If you have a small kiln in which to test that would be a good route; you could also use some of your smaller forms as "real world" test tiles.  I expect that Standard being a clay company may put enough clay in their glazes to mitigate shrinking issues in single firing, but perhaps they would comment to a well worded inquiry. If your tests showing crawling or such, you could try adding bentonite 1 percent and retest.

As the discussion under the photos mentions, I glaze when bone dry, and generally pour the interiors and spray the exteriors in close succession with no problems with my clays.  How one applies plays into the success too, I suspect.

Excellent article by Steven Hill at http://ceramicartsdaily.org/wp-content/uploads/2009/02/cmjan06hill.pdf 

It is four (or seven) years old now, but does address some of your issues.

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