John Johnson on thu 8 nov 01
Greetings,
My family is taking up ceramics again, twenty years after my last
community college class. The kids have already taken classes from a
nearby home-studio teacher. My wife is enrolled in Ceramics One down at
the local JC to get reacquainted with the fundamentals. I'm putting
together a studio with an electric kiln behind the garage.
Now I'm trying to decide what to start with: earthenware or stoneware?
We'd like to do lowfire projects with the kids, but the wife wants to
throw and bisque stoneware to take to school for next semester's glazing
class. I'd prefer to stick with a single claybody.
Will ^6 stoneware satisfy all needs? What happens when you finish ^6
bisqueware with ^06 glazes? What happens when you fire ^6 bisque with
^10 glazes?
I haven't found these questions addressed in any textbook. Perhaps some
of you could speak from experience.
Much Obliged
John Johnson
Ventura California
CINDI ANDERSON on fri 9 nov 01
Hi
Here is some information that should help.
http://www.bigceramicstore.com/Information/tip17.htm
Of course there is also tons in the archives which are here.
http://www.potters.org/categories.htm
You can use high fire clay for low fire, but it probably won't be as strong as a
well formulated low fire clay which gets you as close to vitrification as possible
at low fire temperatures. But you mentioned a cone 6 bisque and a cone 06 glaze
firing. This might be a good approach to achieve your goal. It gets the clay
vitrified and allows you to use the low fire glazes. It is possible you will have
glaze fit problems, but I have heard from several people who are doing this and say
it works.
You also mentioned a cone 10 glaze firing with a cone 6 bisque. You definitely
don't want to take a cone 6 clay to cone 10 or it is likely to melt.
With a cone 6 glaze firing and a cone 6 clay, you want to bisque low fire (usually
cone 08-06) so the clay is porous enough to absorb the glaze.
This may be confusing, why with high fire glazes you want the glaze higher than
bisque, but low fire glazes it is ok to bisque higher than you glaze. The reason
is that at high fire there is interaction between the clay and the glaze. At low
fire you don't get that interaction, so it is less critical. Also, you often dip
pieces at high fire and need the piece to absorb while dipping. Low fire glazes
are usually painted on and don't depend on porosity to absorb the glaze..
Cindi
John Johnson wrote:
> Greetings,
>
> My family is taking up ceramics again, twenty years after my last
> community college class. The kids have already taken classes from a
> nearby home-studio teacher. My wife is enrolled in Ceramics One down at
> the local JC to get reacquainted with the fundamentals. I'm putting
> together a studio with an electric kiln behind the garage.
>
> Now I'm trying to decide what to start with: earthenware or stoneware?
> We'd like to do lowfire projects with the kids, but the wife wants to
> throw and bisque stoneware to take to school for next semester's glazing
> class. I'd prefer to stick with a single claybody.
>
> Will ^6 stoneware satisfy all needs? What happens when you finish ^6
> bisqueware with ^06 glazes? What happens when you fire ^6 bisque with
> ^10 glazes?
>
> I haven't found these questions addressed in any textbook. Perhaps some
> of you could speak from experience.
>
> Much Obliged
>
> John Johnson
> Ventura California
>
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