Randy McCall on tue 9 sep 08
I want to test a glaze that I have combined using three different glazes to
see if I can get comparabile results where I have layered the glazes. The
glaze ingredients have gotten quite extensive and I would like to simplify
it if possible and was wondering if someone would help me? I will send you
the results after testing. Whenever I layered the glazes I got a great
result. If not I may just use the oxides with a matt glaze that is already
working for me.
Cone 6 Matt
Amount Ingredient
5 Gerstley Borate--1999
2 Whiting
41 Feldspar--Custer
12 Ball Clay Number 1
10 Red Art
4 Spodumene--Gwalia
9 Dolomite
7 Bone Ash
3 Talc
2 Lithium Carbonate
5 Silica
100 Total
Glaze does not include the oxides.
Randy
Cotton Patch Pottery
members.tripod.com/~McCallJ/index.html
Timothy Joko-Veltman on tue 9 sep 08
Here's what I got based on the analyses provided with INSIGHT:
47.13 Custer Spar
15.46 Spodumene
19.92 Dolomite
9.75 Silica
7.31 Bone Ash
5.05 Gerstley Borate
1.38 EPK
This will be slightly glossier, and has a fractionally smaller CTE.
You can probably round to the nearest 1/10% without visible difference
in results (and it's easier to be accurate with smaller batches, too).
Cheers,
Tim
Ron Roy on mon 15 sep 08
Hi Randy,
I only got rid of two ingredients but I did get the expansion lowered a bit
- I used another ball clay but I don't think that will be a problem.
I also don't think you will get the same results as layering 3 glazes. Now
that I think of it - does anyone layer the same glaze with different
opacifiers and colours in it? Seems to me there could be some advantage to
that sort of system in terms of fit and compatibility.
McCall triple mix simplified - RR
F3134............... 5.50
CUSTER SPAR......... 34.00
BELL DARK........... 16.50 < my ball clay
RED ART............. 10.50
AUSI SPOD........... 5.00
DOLOMITE............ 13.50
BONE ASH............ 6.50
LITH CARB........... 2.00
SILICA.............. 6.50
----------
100.00
FORMULA & ANALYSIS
------------------
*CaO........ .47 10.01%
MnO2....... .00 .00%
*Li2O....... .11 1.32%
*MgO........ .22 3.41%
*K2O........ .12 4.39%
*Na2O....... .08 1.85%
Fe2O3...... .02 1.13%
TIO2....... .01 .40%
B2O3....... .05 1.41%
AL2O3...... .38 15.05%
SiO2....... 2.52 57.98%
P2O5....... .06 3.07%
RATIO 6.55 (Original is 6.56)
EXPAN 515.85 (Original is 533.03)
RR
>I want to test a glaze that I have combined using three different glazes to
>see if I can get comparabile results where I have layered the glazes. The
>glaze ingredients have gotten quite extensive and I would like to simplify
>it if possible and was wondering if someone would help me? I will send you
>the results after testing. Whenever I layered the glazes I got a great
>result. If not I may just use the oxides with a matt glaze that is already
>working for me.
>
>Cone 6 Matt
>Amount Ingredient
>5 Gerstley Borate--1999
>2 Whiting
>41 Feldspar--Custer
>12 Ball Clay Number 1
>10 Red Art
>4 Spodumene--Gwalia
>9 Dolomite
>7 Bone Ash
>3 Talc
>2 Lithium Carbonate
>5 Silica
>
>100 Total
>
>Glaze does not include the oxides.
>
>Randy
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Michael Wendt on tue 16 sep 08
Ron,
I use chun base glaze and layer with it too.
I have 5 different layering glazes, 3 that are chun:
pale blue chun with 3% TiO2, 0.5% CoO
dark green chun with 4% CuO
White chun with 10% Ultrox
The last two are:
Mt St Helens Volcanic Ash glaze
Toshiko White Mat with 10% Ultrox, 5% TiO2,
2% Red Iron Oxide, 2% 30 mesh Scoria rock
found locally. I have photos of the 5 layer scenes
on all of my web site sections dealing with pottery.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave.
Lewiston, Id 83501
U.S.A.
208-746-3724
wendtpot@lewiston.com
http://www.wendtpottery.com
http://UniquePorcelainDesigns.com
Ron Roy wrote:
Hi Randy,
I only got rid of two ingredients but I did get the
expansion lowered a bit
- I used another ball clay but I don't think that will
be a problem.
I also don't think you will get the same results as
layering 3 glazes. Now
that I think of it - does anyone layer the same glaze
with different
opacifiers and colours in it? Seems to me there could
be some advantage to
that sort of system in terms of fit and compatibility.
Steve Slatin on tue 16 sep 08
Ron --
There are two combinations I do fairly
regularly that are the same base glaze
with different colorants. They do not
resemble the same glazes mixed -- color
and texture are different.
I have not seen a fit/compatibility
difference, but that could just be the
clays I was testing with.
FWIW, I do find layering with different
bases is usually more interesting --
just personal preference, but I see
more 'motion' at the overlap.
Steve Slatin --
--- On Mon, 9/15/08, Ron Roy wrote:
> Hi Randy,
>
> I only got rid of two ingredients but I did get the
> expansion lowered a bit
> - I used another ball clay but I don't think that will
> be a problem.
>
> I also don't think you will get the same results as
> layering 3 glazes. Now
> that I think of it - does anyone layer the same glaze with
> different
> opacifiers and colours in it? Seems to me there could be
> some advantage to
> that sort of system in terms of fit and compatibility.
>
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