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glaze tests for textured glazes, gartside chats, cone 6, ox.

updated tue 22 feb 05


Alisa Clausen on mon 21 feb 05

Glaze tests for Texture glazes, Gartside Chats, cone 6, ox.

Photos are better than descriptions and are shown at=20

in an album called Gartside Chats, Texture Glazes.

Important: Apply these glazes very thickly. There should be cracks in =
the dried surface of the glaze. =20

Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)

Information for tests is collected from testing and recipes from=20
Brian Gartside, Bacia Edelman, Ian Currie, Lana Wilson, Brian Kemp, =
others and line blend experimentation.

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)=20
80c p/h to 1240c (176f - 2264f)
10 min. soak
cool down max. to 1100c (2012f)
Hold 1 hour
Shut off kiln

These blends below are all the 50/50 proportion of various line blends I =
see Brian Gartside's website for more information and how to make his =
test tile boats.

Commercial Transparent Glaze, cone 6 and the following:
Bright White labyrinth patterned glaze, has a brain tissue pattern. =

Zircopax plus 3% Rutile
Similar to above but pattern is less defined and color is a soft yellow.

Tin Oxide
Bright white glaze that is dry and cracked. In some areas the cracking =
patterns are uniform and square. =20

Tin Oxide plus 3% Rutile
Slightly softer white dry glaze. The cracking patterns are more random =
and larger.

Titanium Dioxide
A dry, parched glaze with few but large cracks. Light yellow in color.

Titanium Dioxide plus 3% Rutile
Dry, parched glaze with more cracking then without the Rutile. Darker =
yellow in color.

Magnesium Carbonate
A well melted transparent glaze with slightly raised soft white islands =
throughout. The glaze is smooth and resembles rice floating in water.

Magnesium Carbonate plus 3 Rutile
A well melted transparent glaze with yellow semi mat large speckles =


50% Commercial semi mat green glaze, cone 6 with 50%

A dry, parched glaze that resembles a cracked river bed. Light green =
overall color.

Titanium Dioxide
A semi mat yellow and orange ground with a large blossom of a cracked =
dry green glaze where thickest. =20

Titanium Oxide
A semi mat lichen effect with both small and larger islands of irregular =
shapes tightly spaced. =20
Varied green colors throughout surface.

Magnesium Carbonate
Similar to above but larger islands with more space in between. =20

100 Ceramic Cement with Ochre brushed in loosely mixed.
Cement hard and dry surface that shows the brush marks and swirls of =
color as it was placed on the tile.
Filled in a crack in the bisqued tile with no evidence of the crack =
after firing.


Ian Currie Lichen Grid
Please see Ian's website at=20
to calculate grids, etc.
or come to our workshop October 22, 23, Denmark.

Corner C recipe=20
90 Nepheline Syenite
60 Frit
150 Lt. Magnesium Carbonate
6 Cobalt Carb.
9 Rutile

Grid 16
24 Neph. Syenite
16 Frit I used local Frit J, a Boron Frit
40 Lt. Magnesium Carb.
20 Kaolin
2 Cobalt Carb.
3 Rutile

Larger, melted, rounded, raised islands, spaced. Blue gray in color.

Grid 23, slight variation in quantities
20 Neph. Syenite =20
13 Frit J
33 Lt. Magnesium Carb.
11 Kaolin
23.5 Silica

Varied in size islands, flatter than above, tightly spaced, irregular =
shapes. Blue gray in color.

There are also some poor photos in the album of how I used these =
textured glazes in small quantities on pots and sculptures.
These have been very exciting experiments. I know that there is only =
the thin sky between us and Ababi, and he has=20
inspired me as much as the others.

Regards from Alisa in Denmark

brian on tue 22 feb 05

On 21/2/05 Alisa wrote ....
>Photos are better than descriptions and are shown at
>in an album called Gartside Chats, Texture Glazes.

I was intrigued by your use of a couple of commercial glazes in your
fifty-fifty mixtures. It just confirms that once you realise which
ingredient is the "active" and erratic in behaviour then it doesn't
really matter what you choose for the other half.
For instance Magnesium Carbonate(light) will perform its antics most
materials you choose to use with it. In my work I have found that
doubling the MgCo(light) really encourages the crawling effect.
I also add coloured stains to add to the drama.

Brian Gartside
Pukekohe, New Zealand