Erin Hayes on thu 2 oct 97
Hi All!
Some of my second-quarter students are testing glazes, and their
searching has put me in mind to ask you all if anyone has a favorite
Cone 10 clear that they think is especially fine. We have had some
trouble in the past with crawling when clears have gone over slipwork,
but had finally found a clear which doesn't crawl. However, it needs a
hotter Cone 10 than most of our other glazes.
Does anybody have a glaze you would suggest? We are in a testing mood!
Thanks!
Erin. (looking forward to NCECA and meeting Terry Sigillata at Mel's)
--
Erin Hayes
Yakima Valley Community College
PO Box 1647
Yakima, WA 98907-1647
Vince Pitelka on fri 3 oct 97
>Some of my second-quarter students are testing glazes, and their
>searching has put me in mind to ask you all if anyone has a favorite
>Cone 10 clear that they think is especially fine.
Erin -
The following are two which we use with good results. The second one was
originally a ^9 glaze, which did in fact look like MUTTON FAT at ^9. But at
^10, especially a high ^10, it is a satin clear which works especially well
over slip decoration. I use it on most of my slip trailing and
feather-combing. Put it on thin.
Shiny Clear - ^10 oxidation/reduction
Whiting 19.2
Flint 32.3
EPK 19.6
Kona F-4 Feldspar 27.0
Zinc Oxide 1.9
Reliable gloss clear, but tends to craze and/or go milky when thick.
Satin Clear - ^10 oxidation/reduction
G-200 Feldspar 29.1
Ball Clay 15.4
Neph Sy 13.4
Cornwall Stone 13.1
EPK 10.2
Whiting 9.7
Talc 5.4
Barium Carb 3.7
This was originally a ^9 glaze called Mutton Fat, and at ^9 it looks like
what the name says. But applied thin at ^10 it's a nice satin clear. But
apply thin or it turns to mutton fat.
Good luck -
- Vince
Vince Pitelka - vpitelka@DeKalb.net
Home 615/597-5376, work 615/597-6801, fax 615/597-6803
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Erin Hayes on sat 4 oct 97
Thanks for the glazes, Vince.
Is it just "one of those things" that clear glazes are really yukky
unless they are super-thinly applied? I don't remember having all that
much trouble with them in grad school!
Erin. (rejoicing in: 1.Friday; 2.A last load of show work bisquing
tonight and 3.All my show work being totally finished before Tuesday!)
--
Erin Hayes
Yakima Valley Community College
PO Box 1647
Yakima, WA 98907-1647
Vince Pitelka on sun 5 oct 97
>Is it just "one of those things" that clear glazes are really yukky
>unless they are super-thinly applied? I don't remember having all that
>much trouble with them in grad school!
Erin -
My tendency to put that disclaimer on clear glazes comes perhaps from the
too-common habit of applying almost ALL high fire glazes too thick. There
are some which benefit from thick application, and only the individual
potter can determine this, but I tend to like those high-fire pots where the
clay-glaze interface is close to the surface. The glaze feeds on the body,
but it is a two-way relationship. If the glaze is thick, the interface is
deep beneath the surface. As I said, with some glazes that is entirely
appropriate, but I like to see people give it a chance and see what happens.
Thick clear glazes usually craze and/or turn to snot. Saying "apply medium
thickness" is too vague. So I say, apply thin.
- Vince
Vince Pitelka - vpitelka@DeKalb.net
Home 615/597-5376, work 615/597-6801, fax 615/597-6803
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Liz Dodge on mon 6 oct 97
At the Potters Studio in Berkeley, our studio clear is:
LISA'S CLEAR Cone 10 (ox. or Re.)
EPK 19.7
Flint 34
Whiting 19.7
Kona Spar 27.6
this glaze is a gloss clear much appreciated by people using underglazes
because the colors come through looking great (assuming they aren't the kind
that burn off due to high temp or reducing atmospheres). Not runny,
forgiving of overlaps.
Our previous clear was similar except it was made with potash spar instead of
soda spar and came out cloudier; on some clays it even looked a little like
celadon:
Lisa's Clear cone 10 (Ox or Red.)
Custer Spar 27
EPK 20
Whiting 20
Flint 33
P.S. The Berkeley Potters Studio will be moving in the next month or so -
I'll post our new address a little later (900 block of Cedar St., - I can't
remember the exact address & don't want to post the wrong number). Do you
have any idea how hard it is to move 25 years of accumulated stuff??? Pray
to the kiln goddesses for us!)
Liz Dodge
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