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Re: Firing questions


From: The Austin's (whest177_at_TeacherArtExchange)
Date: Sun Mar 23 2003 - 18:14:48 PST

I didn't know there was a scientific reason not to fire the two together. I
found out the hard way that one sure way to ruin a kiln full of projects is
to put one bisque that blows up in with a bunch of glazed pieces. The bisque
manages to embed itself onto EVERY piece in the kiln! :-(

> Also, another reason you don't fire bisque and glazes together:
> Cone 04 is bisque temperature. You bisque to this temperature so that
> your clay will be as hard as you want it to be before you glaze. Your
> glaze temps for 05 or 06 are lower than 04 bisque. Reds and other
> colors that are fired to 04 don't come out right. When you only bisque
> to 05-06, you run the risk of leaving your clay body not fully fired for
> maximum durability and strength. Also, some glazes won't "fit" right on
> a skimpy bisque, and you are inviting glaze flaws, especially with
> underglazes. Hope this makes sense.