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GLAZE FORMULAS  --  Cone 10 Reduction
petroglyph artwork

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Cone 6/7 Formulas  |  Raku Formulas

Listed below are some cone 10 reduction glaze formulas recently used at ASU. Several I modified and tested, several were developed by students in Kurt Weiser's ceramics classes, and some are ASU studio glazes.  If you adjust the formulas, please let me know about your results. If you use the formulas, I'd like to see digital images of your favorite results. Inquiries welcomed. The ASU cone 10 reduction kiln is a 70-foot, downdraft, gas-fired car kiln.

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All formula amounts are weights of materials.

Pueblo Black

G200
2160
#6 Tile Clay
1200
Dolomite
1200
Whiting
240
Borax
275
Cobalt Carbonate
335
Red Iron Oxide
280
Bentonite
100

Results:  Black/dark gray, speckled on tiles, streaked on vertical ware, satin matte, reflective, shows finger prints. This formulation could benefit from some modification to increase the silica content. Not recommended for food ware.
petroglyph ceramic plaque

Turquoise Matte

Nepheline Syenite
1725
Strontium Carbonate
597
OM-4 Ball Clay
187
Flint
213
Lithium Carbonate
81
Copper Carbonate
81

cone 10 ceramic bowl

Turquoise Matte glaze exterior with black interior.  Use with caution regarding thickness; this formula will run.  I recommend spraying.

From Lynn W. I tried the Pueblo Black at cone 6 in an electric kiln with a dark purchased clay, Brooklyn Red. I dipped the ware and loved all the results.  I made it very thin and dipped it once to get the fake burnished look and twice to get a more glaze looking black. I used Axner's red underglaze pen for design over it ...the stuff that comes in bottles with trailing points... It showed up well on the black.  

CLICK ON IMAGES FOR LARGER FILES.

Bone Ash

G 200 Feldspar 4000
Dolomite 3000
EPK 2500
Bone Ash 500
 
Bone Ash is one of my favorite glazes. Warm browns and tans depend on iron, usually in the clay, and on reduction firing. If you have a glaze with results similar to this formula, I would like to try it.

handprint art on thrown vessel

Right: Large Porcelain Bowl. Exterior is Bone Ash, interior is glazed Purple Haze, outside rim is Stoneware Blue.

cone 10 bottlecone 10 wedding jar

Above: Bone ash sprayed over red iron oxide. I often use a thin undercoat spray of red iron oxide to warm this formula, especially on white clay bodies. I spray the red iron and water mix. Try applying only enough to not entirely obscure the bisque ware color. To vary the glaze color, vary the the thickness of the glaze (handprint has less glaze) and oxides (bottles have relatively thick oxide use).

cone 10 ceramic bowl
stoneware planters
Bone ash on iron body planters.

cone 10 stoneware lamp base

CLICK ON IMAGES FOR LARGER FILES.
Next Pages:   Cone 6/7 Formulas  |  Raku Formulas

  
Woo Blue
G-200 Feldspar 4158
Whiting 1784
Silica 2675
Ball Clay 1283
Bentonite 100
Red Iron Oxide 391
Rutile 391

habd-thrown bown with cone 10 glaze

Note the change in color with variations in glaze thickness, from light brown to blue.

rock art plaque

CLICK ON IMAGES FOR LARGER FILES.

Stoneware Blue
G-200 Feldspar 6356
Whiting 1956
EPK 1692
Rutile 400
Cobalt Carbonate 50
Red Iron Oxide 50

White stoneware pitcher  glazed by dipping.
White stoneware pitcher
glazed by dipping.

 

 

 

Stoneware Blue on iron-rich clay body.

These relief designs were sprayed from a low angle to emphasize the images. This technique results in considerable variation in glaze thickness. I also employ this technique to spray undercoat oxides, sometimes spraying one oxide from one direction and another from the opposite direction. The best result achieved with this technique gives the viewer the impression that the piece changes colors as the angle of view changes.
Orange Carbon Trap Shino
Nepheline Syenite 40
Soda Ash 12
OM-4 15
Kona F-4 Feldspar 13
EPK 8
Spodumene 9
Red Art Clay 3

orange carbon trap shino bowl

Carbon trapping is on the thickest glaze areas on this bowl. Glaze was sprayed.

shino vessel with two spouts

More Shino images: Rock Art Tile
Sand Island Glyph

Temoku

G-200 Feldspar

4530

Silica 2264
Whiting 1699
Kaolin 1289
Red Iron Oxide 859
Zinc Oxide 218
Bentonite 40
Bray's Red Ash
G200 41.21
Flint 27.03
Colemanite 9.01
Dolomite 9.01
Barium Carbonate 4.51
Whiting 2.20
Zinc Oxide 1.81
EPK 1.50
Tin Oxide 2.70
Copper Carbonate 0.51

red ash glaze on sheep kokopelli plaque
This formula runs easily on vertical surfaces. Apply thin.

CLICK ON IMAGES FOR LARGER FILES.

Lahaina Lavender

Custer Feldspar 1720
Silica 1200
Whiting 720
Talc 160
Bone Ash 80
EPK 40
Gerstley Borate 40
Bentonite 40
Copper Carbonate 35
Base recipe thanks
to Judith Marks
Crater Rim Ceramics, Hawaii.

carbon trap shino bowl
Click images for larger files.

Next Pages:   Cone 6/7 Formulas  |  Raku Formulas

Purple Haze

G200 43.6
Flint 18.64
Colemanite 6.0
Whiting 7.72
Zinc Oxide 3.67
EPK 2.35
Dolomite 5.56
Bentonite 1.87
Tin Oxide 2.83
Copper Carbonate 0.95
Titanium Dioxide 3.0

Purple Sludge

G200 250
Silica 125
Whiting 40
Dolomite 25
Gertsley Borate 25
Barium Carbonate 25
Zircopax 12.5
Tin Oxide 5
Copper Carbonate 10
Cobalt Carbonate 1.2
Purple Haze on white stoneware.Purple Haze cone 10 glaze on white stoneware.
Both pieces applied by spraying.

Purple Haze over red iron oxide.

Purple Haze cone 10 glaze over red iron oxide.

This glaze, when applied by dipping, has migrated to the shelf.  I recommend spraying, or wetting the greenware, drying more than an hour, then dipping (or adjust the formula). Use with caution. One of the most colorful results achieved was inside a large bowl near the flue in a downdraft kiln. The local temperature was near cone 11, the glaze ran and pooled, and all the cooper glazes in the same kiln enhanced the color remarkably. The exterior glaze ran down to the kiln wash.

Aspen
Grolleg 30
Whiting 30
Barium Carbonate 30
Flint 10
Rutile 4
Copper Blue Green
Cornwall Stone 46
Whiting 34
EPK 20
Copper carbonate 4
Tin Oxide 4
Erica's Blue Ash
Cryolite 2
Fluorspar 22
Hardwood Ash 29
Tille #6 Clay 22
Silica 25
Magnatite 1
Cobalt 2
Tin Oxide 5
Lee's Copper Red
G200 41.21
Flint 27.03
Colemanite 9.01
Dolomite 9.01
Barium Carbonate 4.51
Whiting 2.20
Zinc Oxide 1.81
EPK 1.50
Tin Oxide 2.70
Copper Carbonate 0.51

Spar 42.5
Flint 26.6
Colemanite 8.8
Dolomite 8.8
Barium Carbonate 8.8
Whiting 2.7
Zinc Oxide 1.8
Tin Oxide 2.70
Copper Carbonate 0.514

ARTWORK by James Q. Jacobs

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