William Lucius on thu 13 apr 06
Here is mine (a variation of Hamada Tenmoku)!
#: 4 Cone: 5-6 Finish: Tenmoku Atmosphere: Neutral
China Clay 5.0
Nepheline Syenite 21.0
Silica 40.0
Unwashed Ash 8.0
Whiting 11.0
Red Iron Oxide 15.0
Bentonite 2.0
The silica makes it settle quickly, and the iron oxide stains everything =
in the studio.
Too much reduction makes it a blackish brown with blue crystals on =
vertical surfaces. It works best with a neutral atmosphere. =20
Under full oxidation it comes out on the orange side of red.=20
I dip it quickly to ensure breaking, my notes say not to double dip.
It acts differently on different clay bodies (I use only native clays) =
and I rarely fire above cone 5 1/2
I hope you find it useful.
William A. Lucius, Board President
Institute for Archaeological Ceramic Research
845 Hartford Drive
Boulder, CO 80305
iacr@msn.com
Linda Ferzoco on thu 13 apr 06
Please tell how you achieve a neutral atmosphere in a
(presumed) electric kiln? Or are you using another
fuel source?
Thanks, Linda Ferzoco
Pacifica, CA, where we may have a day without rain!
--- William Lucius wrote:
> Here is mine (a variation of Hamada Tenmoku)!
>
> #: 4 Cone: 5-6 Finish: Tenmoku
> Atmosphere: Neutral
>
William Lucius on fri 14 apr 06
My studio kiln is an old updraft that has stackable rings of soft brick =
and three natural gas venturi burners. I can fire in oxidation, but =
rarely do since I prefer how glazes and body clays react to a bit of =
carbon in the atmosphere. If you are familiar with metallurgy, =
oxidation is akin to Roman iron swords whereas neutral (or a slightly =
reducing atmosphere) gives you Toledo steel rapiers! If I did not have =
the ability to control firing atmosphere I doubt that I would continue =
as a studio potter. Of course as a ceramic archaeologist we are always =
trying to figure out how to control the firing atmosphere in pit kilns. =
If you only have an electric kiln by all means test out the glaze recipe =
I sent. =20
William A. Lucius, Board President
Institute for Archaeological Ceramic Research
845 Hartford Drive
Boulder, CO 80305
iacr@msn.com
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