Gretchen Woodman on sat 28 oct 00
I am relatively new to glazes and I was wondering if I
could fire a piece(cone 5 clay) with a cone 5 glaze in
my first firing and then refire it at cone 05 with a
low fire underglaze on it. Would the underglaze
adhere well? Would the previous glaze(cone 5) affect
the outcome of the underglaze, or vice versa? I have
a mexico point green I would like to try with a red
underglaze. Any information would be much
appreciated!
gretchenwoodman@yahoo.com
__________________________________________________
Do You Yahoo!?
Yahoo! Messenger - Talk while you surf! It's FREE.
http://im.yahoo.com/
Snail Scott on sat 28 oct 00
Gretchen-
Yep, you sure can! I often refire my sculpture to
progressively lower and lower temperatures, adding
new layers of glaze and overglaze each time. Usually,
I start at ^6 or so, then ^06, then ^020. Every
temperature range has something different to offer,
it all comes down to what the piece needs.
Underglaze usually sticks really well to glaze, because
of its high gum content. If you make your own underglaze,
be sure to add plenty of CMC. Sometimes the underlying
glaze will affect the top coat and flux it a bit; it
depends on the particular glaze. Some glazes are slightly
'melty' well below their maturation temperature.
Most glazes look just the same after refiring to a lower
temperature, but some change radically! Do tests first,
covering a wide range of conditions of thicknesses and
formulations of both components (the ^5 and the ^05).
If you put a clear over your underglaze, that needs to be
tested, too; it could flux your underlying ^5 glaze a bit.
(Also, if your green glaze contains copper, it is more
likely than most to affect what's added, although commercial
underglazes are pretty darn stable.)
-Snail
At 07:30 AM 10/28/00 -0700, you wrote:
>I am relatively new to glazes and I was wondering if I
>could fire a piece(cone 5 clay) with a cone 5 glaze in
>my first firing and then refire it at cone 05 with a
>low fire underglaze on it. Would the underglaze
>adhere well? Would the previous glaze(cone 5) affect
>the outcome of the underglaze, or vice versa? I have
>a mexico point green I would like to try with a red
>underglaze. Any information would be much
>appreciated!
>
> gretchenwoodman@yahoo.com
Fraser Forsythe on sat 28 oct 00
Hi Gretchen.
Good question.
I'd think of the cone 05 glaze(piece) like the substrate(the thing you're putting
your glaze on) and say sure, refire.
If the cone 5 glaze has a wide melt there will be a greater chance of partial
melting and therefore affecting the over (cone 05) glaze.
If you mean by 'adhere' applying the 05 glaze to the cone 5 piece...good luck! The
05 glaze will adhere once it's at temperature but even then I'd expect some
interesting anomalies. Your cone 5 piece will be vitrified so none of the cone 05
will get 'into' the piece before firing.
I'd do it anyway - on a test piece...and let us know what happens.
Fraser
Gretchen Woodman wrote:
> I am relatively new to glazes and I was wondering if I
> could fire a piece(cone 5 clay) with a cone 5 glaze in
> my first firing and then refire it at cone 05 with a
> low fire underglaze on it. Would the underglaze
> adhere well? Would the previous glaze(cone 5) affect
> the outcome of the underglaze, or vice versa? I have
> a mexico point green I would like to try with a red
> underglaze. Any information would be much
> appreciated!
>
| |
|
