Janet Price on sun 12 oct 97
I'm looking for a very clear and fluid glaze to use on small tiles with
detailed designs. The tiles are porcelain and fired to cone 5. The
best glaze I've found so far is a commercial cone 04 glaze, which is a
wheat color. What I want is a base glaze like that so I can add my own
oxides. I'd also like the base glaze to be one in which copper will
produce a green rather than a turquoise. My guess is that the glaze I'm
looking for will have a normal firing range around 04 and will be too
fluid at cone 5 to be used on anything but flat surfaces. I have tried
other cone 04 commercial glazes and a number of them work OK, but not
as fluid and clear as I'd like. (A burgundy cone 04 is a nice mauve at
cone 5, however.) I am clearly breaking rule number one here. :-) Thanks
in advance for any guidance that will keep me from simply testing all
cone 04 clear glaze recipes (no lead) I can find until I get one that suits.
In return, I'll share a glaze I use to induce runs on vases. It's
Zakin's GK glaze with 15% fireplace ashes, unwashed. By itself it looks
stony with a lot of visual texture. But if you dip the bottom 2/3 of a
small vase in one glaze, brush this glaze on the top 1/3, and then brush
another glaze over it, the top glaze will run down over the bottom
glaze, often in nice swoops and drips. The exact pattern varies with
the two glazes, but I've tried lots of combinations that are
interesting.
The glaze recipe is:
18 frit 3124
7 magnesium carb
10 neph sye
11 strontium carb (substituted for 15 barium)
15 spodumene
10 EPK
13 whiting
12 superpax (original was opax)
2 bentonite (I always add this)
15 mixed fireplace ashes, unwashed
--
Janet Price, Chief Information Officer
Carroll College, Waukesha WI 53186
jprice@carroll1.cc.edu or jprice@ccadmin.cc.edu
414-524-7120
Ardis Bourland on mon 13 oct 97
Is that ash glaze formula you so nicely shared with us a c/04 or c/5 glaze??
TIA.
Ardis
Carolynn Palmer on tue 14 oct 97
Conrad's G 210
Gerstley Borate 50.0
Flint 32.5
Kaolin 17.5
Described by Conrad as "Bright Gloss" for Cones 5 through 7.
I fire in an oxidation atmosphere and have fired this glaze from cone 4 to
cone 9. At 4 -6 it stays where it is put without becoming runny. It becames
very fluid at 8 or 9 and will run where thick.
This glaze is perfectly clear, but I have added various oxides to produce
colors (including copper carbonate for green) and Titanium or Rutile to muddy
these colors.
I have used this glaze on dinnerware and also, floor tile. It wears very
well.
Carolynn Palmer, Somerset Ctr, Michigan
OWL POTTER@AOL.com
Janet Price on tue 14 oct 97
Ardis Bourland said
>
> ----------------------------Original message----------------------------
> Is that ash glaze formula you so nicely shared with us a c/04 or c/5 glaze??
> TIA.
> Ardis
>
>
cone 5. Sorry.
--
Janet Price, Chief Information Officer
Carroll College, Waukesha WI 53186
jprice@carroll1.cc.edu or jprice@ccadmin.cc.edu
414-524-7120
Ron Roy on thu 16 oct 97
The calculated expasion/contraction of this glaze seems very low. Because
the B2O3 content is well over 12% the expansion factors I use will be
inaccurate so I can't say to what extent the expansion will be a problem. I
am saying - test this glaze on some ware - glazeing the inside only and at
least freeze it for 24 hours before using it on a lot of ware.
>----------------------------Original message----------------------------
>Conrad's G 210
>
>Gerstley Borate 50.0
>Flint 32.5
>Kaolin 17.5
>
>Described by Conrad as "Bright Gloss" for Cones 5 through 7.
>
>I fire in an oxidation atmosphere and have fired this glaze from cone 4 to
>cone 9. At 4 -6 it stays where it is put without becoming runny. It becames
>very fluid at 8 or 9 and will run where thick.
Ron Roy
93 Pegasus Trail
Scarborough,Canada
M1G 3N8
Evenings, call 416 439 2621
Fax, 416 438 7849
Studio: 416-752-7862.
Email ronroy@astral.magic.ca
Home page http://digitalfire.com/education/people/ronroy.htm
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