Karin Hurt on tue 2 dec 03
I just got through with a glaze test firing of some Cone 6 terracotta =
pieces.=20
I used undergllazes on some shallow bowls with a clear glaze over it. =
The pieces are an awful gray-brown color, they are so barf awful that =
I'll toss them into the side of my hill and hope they pulverize. I =
imagine that I should have bought a Cone 1 terracotta. My question is =
- at what Cone does one get a decent terracotta color?
Karin=20
Lake Havasu City, Arizona
http://www.laughingbearpottery.com
Christy Pines on tue 2 dec 03
Karin -
Don't know if you're looking for the color of terracotta or the porous property of terracotta, but I use a beautiful red clay from Sheffield Pottery (Sheffield, Massachussets, USA). Cone 6-10 oxidation only. Coarse bodied clay with a great orangy-brown terracotta-color. I find it easy to work with and beautiful when fired. I have a piece that I left unglazed on the outside and glazed on the inside and it's fabulous. www.sheffield-pottery.com
christy in connecticut, where there was a dusting of snow on the streets this morning, down here by the Sound. The marsh is all brown and silver and I think I can put away the lawn mower till spring.
-----Original Message-----
From: Karin Hurt
Sent: Dec 2, 2003 5:48 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Glazing - Cone 6 Terracotta clay
I just got through with a glaze test firing of some Cone 6 terracotta pieces.
I used undergllazes on some shallow bowls with a clear glaze over it. The pieces are an awful gray-brown color, they are so barf awful that I'll toss them into the side of my hill and hope they pulverize. I imagine that I should have bought a Cone 1 terracotta. My question is - at what Cone does one get a decent terracotta color?
Karin
Lake Havasu City, Arizona
http://www.laughingbearpottery.com
Snail Scott on tue 2 dec 03
At 06:48 AM 12/2/03 -0700, you wrote:
>I just got through with a glaze test firing of some Cone 6 terracotta
pieces.
>...My question is - at what Cone does one get a decent terracotta color?
I would think that at ^6, a clay might no longer be
considered terra cotta, regardless of the label on
the recipe. (I've fired some commercial terra cotta
clay to ^4 with nice results, but I think I'd call
the end product 'stoneware'.)
I find that the classic 'terra cotta' look can be
found between ^012 and ^1, depending on the effect
you're after. Terra cotta is a very non-specific
term, though, and means many different things,
including a wide range of colors and vitrification.
If you are using underglazes and glaze, though, does
the look of the clay body matter so much? Perhaps a
slip will give any exposed areas the look you want.
-Snail
Tony Hansen on tue 2 dec 03
I do not think it is possible to get the red terra cotta
color under a transparent glaze at cone 6. This effect
depends on a highly non-vitreous clay. Terra cotta clays
fire red at the low end where they are porous and they
turn brown as you fire them higher toward maturity.
Even if the clay is bright red at cone 6 without glaze
the glaze will flux it and turn it yucky brown.
To get terra cotta red under a clear glaze you need to
use a terra cotta body at cone 06-04.
The only method I can think of is a red stained slip
(i.e. chrome-tin, cadmium inclusion)
with a clear glaze on it.
-------8<--------
I just got through with a glaze test firing of some Cone 6 terracotta =
pieces.=20
I used undergllazes on some shallow bowls with a clear glaze over it. =
The pieces are an awful gray-brown color, they are so barf awful that =
I\'ll toss them into the side of my hill and hope they pulverize. I =
imagine that I should have bought a Cone 1 terracotta. My question is =
- at what Cone does one get a decent terracotta color?
-------
Tony Hansen, http://digitalfire.com
Personal Contact Page: http://digitalfire.com/services/contact.php
Calculation/Database Software for Ceramic Industry
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