Julie Holmes on tue 15 feb 00
Last fall, I fired cone 6 clay and glazes (functional pots) in my small,
used electric kiln. I wasn't thrilled with the results. Since then, I have
been using Phoenix Clay which is a Cone 7-10 clay.
This may seem strange but I can more easily imagine the slip and brushwork
options on a pot when the clay is still leatherhard. So - I have begun to
experiment with single firing glazes to Cone 7.
How can I modify my Cone 6 glaze recipes to Cone 7 and to single firing?
Thanks for your tips and suggestions!
Julie (tmik,tmikidk)* Holmes
*themoreiknow,themoreiknowidon'tknow
Cindy Strnad on wed 16 feb 00
Julie,
I know what you mean about the slip and brushwork being easier on leather
hard pots. I sometimes do this too, though not with glazes--with home-made
underglazes (just a bit of Frit 3134 mixed with Mason stain and glycerin--I
don't measure) and of course, it's best to use slips on leather hard ware.
Then I bisque fire and glaze fire as always.
I haven't done any single firing, so I can't help you there except with what
I've read, which is that a glaze for once-firing should have a high
percentage of plastic clay involved. I believe the source I read suggested
around 20%. Many ^6 glazes will do just fine at ^7. You might experiment to
see how yours do. Protect your shelves and give them a trial.
Cindy Strnad
earthenv@gwtc.net
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
Linda Blossom on wed 16 feb 00
You will probably find that your cone 6 glazes will work fine at cone 7.
The glosses may be a little more gloss and the matt ones may seem a little
more shiny. I have slowly moved my firing from 6 to almost 8 and like the
glazes better. The only thing you have to do to the glazes in order to
single fire is to add veegum or cmc to your glazes and then be sure to sieve
(80 mesh). If the glazes are already wet, you can sprinkle the veegum or
cmc over the surface and then mix it and then sieve it. The glaze may seem
a little thicker after the addition of the binder (cmc veegum) but then you
may be brushing your glaze on so a little thicker is better. It is easier
to add it to the dry mix and then wet it all together. When you glaze your
pieces, wipe them with a squeezed out damp sponge.
Linda Blossom
2366 Slaterville Rd
Ithaca, NY 14850
607-539-7912
blossom@twcny.rr.com
-----Original Message-----
From: Julie Holmes
To: CLAYART@LSV.UKY.EDU
Date: Tuesday, February 15, 2000 6:08 PM
Subject: Single firing at Cone 7
>----------------------------Original message----------------------------
>Last fall, I fired cone 6 clay and glazes (functional pots) in my small,
>used electric kiln. I wasn't thrilled with the results. Since then, I have
>been using Phoenix Clay which is a Cone 7-10 clay.
>
>This may seem strange but I can more easily imagine the slip and brushwork
>options on a pot when the clay is still leatherhard. So - I have begun to
>experiment with single firing glazes to Cone 7.
>
>How can I modify my Cone 6 glaze recipes to Cone 7 and to single firing?
>
>Thanks for your tips and suggestions!
>
>Julie (tmik,tmikidk)* Holmes
>
>*themoreiknow,themoreiknowidon'tknow
>
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