All following glazes were tested in the University of Central Florida’s gas kiln. The firing schedules were unfortunately never documented.
CO-1-1
Intense Pink
Cone 9 Reduction
Barium Carbonate | 40% |
Feldspar | 35% |
Zinc Oxide | 15% |
Kaolin | 5% |
Silica | 5% |
Black Nickel Oxide | 1.5% |
- Semi-matte with nice depth, not pink but instead quite purple. Darker and more saturated on stoneware, lighter on porcelain. Very stable. Speckled, could be fixed (possibly by changing to green nickel oxide).
CO-1-2
Intense Pink
Cone 6 Oxidation
Barium Carbonate | 40% |
Nepheline Syenite | 35% |
Zinc | 15% |
Kaolin | 5% |
Silica | 5% |
Frit 3134 | 5% |
Black Nickel Oxide | 1.5% |
CO-1-3
Intense Pink
Cone 6 Oxidation
Strontium Carbonate | 40% |
Nepheline Syenite | 35% |
Zinc | 15% |
Kaolin | 5% |
Silica | 5% |
Frit 3134 | 5% |
Black Nickel Oxide | 1.5% |
Neither looks very nice. CO-1-2 definitely looker nicer than CO-1-3 (more unified surface, more of a pink, still runny). Would need to increase gloss and reduce running.
[Unable to find tiles]
CO-2-1
Ice Crackle
Cone 9 Reduction
Custer Feldspar | 79% |
Silica | 9.5% |
Whiting | 9.5% |
Bone Ash | 2% |
Bentonite | 2% |
- Unusable on stoneware, quite boring and cloudy on porcelain. If I were to continue with it, the objective would be to reduce the cloudiness and increase crackle/crazing effect on stoneware.
CO-3-1
Sun Valley
Cone 9 Reduction
Custer Feldspar | 32.2% |
Silica | 18.3% |
Whiting | 18% |
EPK | 14.1% |
Talc 00 | 9.1% |
Rutile | 7.6% |
- A mottled blue and white. On porcelain, there’s more depth and intermediaries between the blue and white, and lighter/more transparent overall. Possibly slightly runny. On stoneware, blue is more saturated, with a more distinct hare’s fur texture. Quite stable, but thin on edges.
CO-4-1
Bleeding Blue
Cone 9 Reduction
Custer Feldspar | 36% |
Silica | 28% |
Ferro Frit | 9% |
Whiting | 9% |
Barium Carbonate | 6% |
EPK | 5% |
Talc | 4% |
Bentonite | 2% |
Rutile | 4% |
Tin Oxide | 2% |
Copper Carbonate | 1% |
- A glossy mauve with blue speckles. Would be more interesting if the size of the speckles were increased. Very stable and similar on porcelain and stoneware. +2.5% Gerstley borate may increase speckling and glossiness (due to boron).
CO-5-1
Simple Nuka
Cone 9 Reduction
Wood Ash | 35% |
Minspar 200 | 35% |
Silica | 30% |
- Extremely simple glaze. Glossy white, and quite transparent. Interesting texture on porcelain, unusable on stoneware. Intention was a black glaze, with white running, why transparent white? This is to be expected - the example image was over a dark clay body.
CO-6-1
Speckled Red
Cone 9 Reduction
Soda Feldspar | 41.72% |
Silica | 22.25% |
Bone Ash | 10.23% |
Talc | 7.34% |
EPK | 6.45% |
Whiting | 6.45% |
Magnesium Carbonate | 5.56% |
Red Iron Oxide | 11.12% |
- Glossy, earth-red glaze, with some silver showing underneath. Some okay depth, but relatively uninteresting. Similar on stoneware and porcelain. A bit runny, would have to fix.
CO-7-1
Green Crackle
Cone 9 Reduction
Nepheline Syenite | 80.5% |
Whiting | 11.5% |
Silica | 5.5% |
Lithium Carbonate | 2.5% |
Epsom Salt | 2% |
Copper Carbonate | 1.5% |
Chrome Oxide | 0.5% |
- Fairly transparent, high gloss, green crackle. Forest, cool green. Didn’t keep stoneware, so notes are on porcelain. Very runny.
CO-7-2
Green Crackle
Cone 9 Reduction
Nepheline Syenite | 80.5% |
Whiting | 11.5% |
Silica | 8% |
Lithium Carbonate | 2.5% |
EPK | 2.5% |
Epsom Salt | 2% |
Copper Carbonate | 1.5% |
Chrome Oxide | 0.5% |
Very matte, but also no dripping. Interesting matter green with some tone shift, but no crackle or gloss.
[Unable to find tile]
Uncoded
Hadi’s Black Slip
Cone 9 Reduction
Ball Clay | 25% |
EPK | 25% |
Calcined Kaolin | 25% |
Barnard Slip | 25% |
Custer Feldspar | 10% |
Never tested at Cone 9.
CO-8-1
Pale Blue Celadon
Cone 9 Reduction
Wollastonite | 23.5% |
Silica | 20% |
Nepheline Syenite | 16.8% |
Minspar 200 | 13.8% |
EPK | 12% |
Custer Feldspar | 0.9% |
Barium Carbonate | 3% |
Tin Oxide | 1% |
Red Iron Oxide | 0.5% |
- A nice pale blue celadon, stable, but has some sediment on porcelain. Unusable on stoneware due to transparency. Hadi recommends mixing this glaze 50/50 with CO-014-1.
CO-9-1
Textured Black
Cone 9 Reduction
Barnard Clay | 75% |
Minspar 200 | 25% |
- Extremely simple dry looking black with some texture. Very matte. Runny, would need to fix this. Identical on stoneware and porcelain.
CO-10-1
Crystalline Blue by Dick Lehman
Cone 9 Reduction
Strontium Carbonate | 6.32% |
Whiting | 13.68% |
Minspar 200 | 56.84% |
Nepheline Syenite | 15.79% |
EPK | 7.37% |
Cobalt Carbonate | 0.53% |
Titanium Dioxide | 5.26% |
- On porcelain, a sparkly matte blue, somewhat cloudy and some small craters. Slightly runny. On stoneware, stable and glossy, more teal/green. No sparkle. Hadi recommends testing at cone 6.
CO-11-1
Lehman Blue by Dick Lehman
Cone 9 Reduction
Dolomite | 12.09% |
Gerstley Borate | 2.2% |
Strontium Carbonate | 6.59% |
Whiting | 7.69% |
Nepheline Syenite | 36.36% |
EPK | 1.1% |
Silica | 34.07% |
Cobalt Carbonate | 0.66% |
Red Iron Oxide | 2.2% |
Rutile | 4.4% |
Bentonite | 3.3% |
- Very nice blue glaze with a lot of depth. On porcelain, starts as a transparent teal, drips into dark blue/navy. Pools with more vibrant blue. Too runny, would have to fix. More stable but less vibrant on stoneware. More of a true blue throughout with tone variations, and pools as hazy blue. Still slightly runny.
CO-12-1
Trout by Dick Lehman
Cone 9 Reduction
Bone Ash | 1.77% |
Zinc Oxide | 24.56% |
Ferro Frit 3134 | 49.12% |
Minspar 200 | 14.73% |
Silica | 9.82% |
Black Copper Oxide | 4.13% |
Rutile | 3.93% |
- Very nice blue/white/green glaze on porcelain but very runny. Lots of depth. On stoneware, far more earthy, but still quite interesting. Still a bit runny.
CO-13-1
Purple Haze
Cone 9 Reduction
Custer Feldspar | 50% |
Whiting | 8.8% |
Silica | 21.3% |
Kaolin | 2.7% |
Gerstley Borate | 6.9% |
Dolomite | 6.4% |
Zinc Oxide | 4.7% |
Tin Oxide | 3.2% |
Copper Carbonate | 1.1% |
Titanium Dioxide | 3.5% |
- Mostly haze, not purple. More of a very dull and cloudy pink. Too transparent for stoneware, would need more color and increased glossiness. Very stable. Would be interesting to try as a base with various other coloring oxides.
CO-14-1
Chun Glaze (Blue)
Cone 9 Reduction
Potash Feldspar | 39.36% |
Silica | 33.1% |
Whiting | 13.5% |
Barium Carbonate | 9.1% |
Kaolin | 1.8% |
Bone Ash | 1.2% |
Magnesium Carbonate | 0.9% |
Red Iron Oxide | 0.5% |
Nice glossy baby blue, stable on porcelain. More vibrant where application is thicker. Very slight crazing. Unusable on stoneware due to transparency.
CO-15-1
Lucky 11 Chun (Pink/Red)
Cone 9 Reduction
Silica | 35.9% |
Nepheline Syenite | 20.4% |
Whiting | 15.7% |
NC-4 Feldspar | 15.5% |
Gerstley Borate | 10.8% |
Tin Oxide | 1.7% |
Grolleg Kaolin | 1.4% |
Copper Carbonate | 0.4% |
- Not pink or red. White on porcelain, with only slight red hue at thickest point, so should likely be applied thicker. Pretty much transparent on stoneware with some blue spots. Glossy on both.