Patricia Brown on mon 10 oct 05
Hello to everyone;
I am new to the list and new to pottery - wheel throwing. I burnished one
of my pots at the leather hard stage with a spoon. (No terra sig.) My
question is, after I bisque fire this pot to cone 04, can I put a low fire
glaze on it? It's a high fire, stoneware clay that I will be glaze firing
to cone 06. Will the glaze adhere or will it run off? I've ordered a
variety of premixed low-fire glazes to try for my first firing.
Thank you for any help and/or suggestions.
Patricia
Vince Pitelka on mon 10 oct 05
> I am new to the list and new to pottery - wheel throwing. I burnished one
> of my pots at the leather hard stage with a spoon. (No terra sig.) My
> question is, after I bisque fire this pot to cone 04, can I put a low fire
> glaze on it? It's a high fire, stoneware clay that I will be glaze firing
> to cone 06. Will the glaze adhere or will it run off? I've ordered a
> variety of premixed low-fire glazes to try for my first firing.
Patricia -
The glaze will probably stick just fine, but I am curious as to why you went
to the trouble of burnishing it if you were planning to glaze it. As you
have discovered, burnishing is a very time-consuming process that gives a
fine satin shine. Usually people burnish only if they specifically want
that shine.
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/
William & Susan Schran User on tue 11 oct 05
On 10/10/05 5:16 PM, "Patricia Brown" wrote:
> My
> question is, after I bisque fire this pot to cone 04, can I put a low fire
> glaze on it? It's a high fire, stoneware clay that I will be glaze firing
> to cone 06. Will the glaze adhere or will it run off? I've ordered a
> variety of premixed low-fire glazes to try for my first firing.
Yes, you can apply low fire glaze to bisqued high fire clay and glaze fire
to ^06, but the clay will simply remain bisque fired, still porous and still
weak compared to vitrified clay. You may also be faced with glaze fit
issues, the glaze might be crazed after firing.
If you want to only do low firing, why not use an appropriate low fire clay?
--
William "Bill" Schran
Fredericksburg, Virginia
trish1192@VERIZON.NET on tue 11 oct 05
Vince;
Being so new to this, I'm experimenting with a lot of things. My burnished surface was not completely smooth, showing little indents from the spoon.
Thanks for your response. I'm glad to know I can glaze it.
Patricia
Patricia -
The glaze will probably stick just fine, but I am curious as to why you went
to the trouble of burnishing it if you were planning to glaze it. As you
have discovered, burnishing is a very time-consuming process that gives a
fine satin shine. Usually people burnish only if they specifically want
that shine.
Good luck -
- Vince
steve graber on tue 11 oct 05
i use cone 10 clays throghout the workshop so low & hi fire stuff never gets mixed.
cone 10 for raku, etc.
with 05/06 glazes they seem to work well anyway.
see ya
steve
William & Susan Schran User wrote:
On 10/10/05 5:16 PM, "Patricia Brown" wrote:
> My
> question is, after I bisque fire this pot to cone 04, can I put a low fire
> glaze on it? It's a high fire, stoneware clay that I will be glaze firing
> to cone 06. Will the glaze adhere or will it run off? I've ordered a
> variety of premixed low-fire glazes to try for my first firing.
Yes, you can apply low fire glaze to bisqued high fire clay and glaze fire
to ^06, but the clay will simply remain bisque fired, still porous and still
weak compared to vitrified clay. You may also be faced with glaze fit
issues, the glaze might be crazed after firing.
If you want to only do low firing, why not use an appropriate low fire clay?
--
William "Bill" Schran
Fredericksburg, Virginia
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Snail Scott on sat 15 oct 05
At 04:16 PM 10/10/2005 -0500, you wrote:
>...I burnished one
>of my pots at the leather hard stage with a spoon. (No terra sig.) My
>question is, after I bisque fire this pot to cone 04, can I put a low fire
>glaze on it? It's a high fire, stoneware clay that I will be glaze firing
>to cone 06.
>Will the glaze adhere or will it run off?
You can certainly underfire a stoneware clay to
earthewnware temperatures, but glazes will tend
to craze on it. They might craze a bit on actual
earthenware clay, but it will be much worse on
an underfired body. It's up to you whether crazing
will be a big problem. Also, an underfired
stoneware will be more fragile than an earthenware
clay fired to the same temperature.
What you are suggesting will work, but not as well
as using an earthenware clay. Are you using the
stoneware clay because it's all you can get at the
moment, or are you planning to fire most of it to
high-fire temps and this pot just an experiment?
If you are going to make a habit of low-fire glazes,
I'd suggest switching to a low-fire clay.
Bisquing to ^04 is fine in either case, though.
It's a popular choice for bisquing both stoneware
and earthenware.
Why are you burnishing first, though? The effect will
mostly be lost at ^04, even if you weren't going to
cover it with glaze. (Burnishing stays shiniest at
about ^012-^010; above that, it gets progressively
dulled.) Not only will glaze totally hide whatever
burnishing survives the ^04 bisque, but it will
actually make it slightly more difficult to glaze.
(The super-smooth surface, even though it won't be
shiny any more, can make the glaze tend to crack off
during pre-firing handling.) Or was the burnishing
part of a previous plan for the piece before you
decided to glaze it?
The glaze will adhere, but handle with care when
loading the kiln.
-Snail
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