Gerstley Borate 57%
Synthetic Bone Ash 19
Nepheline Syenite 10
EPK 9
Silica 5
Add:
Copper Carbonate 8
Cobalt Carbonate 2
raku pottery glaze
Raku Pottery Glaze: Shiny Copper Flash
The flashing will vary with each firing. This was fired to 1875F and given medium post-firing reduction using newspaper after pulling from the kiln.
Shiny Copper Flash
%75 Gerstley Borate
%12.5 Nepheline Syenite
%12.5 EPK
Add:
%8 Copper Carbonate
%2 Cobalt Carbonate
Raku Pottery Glaze: Copper Matt
The flashing will vary with each firing. Both of these were fired to 1875F and given medium post-firing reduction using newspaper after pulling from the kiln.
Copper Matt
Add
%75 Gerstley Borate
%12.5 Nepheline Syenite
%12.5 EPK
Add:
%8 Copper Carbonate
%2 Cobalt Carbonate
Add:
%16 Synthetic Bone Ash
Raku Pottery Glaze: Emerald Green Copper Flash
The raku glaze of the month is a greenish blue with copper flashes that will vary from firing to firing.
Emerald Green Copper Flash Glaze
Frit 3110: 30%
Frit 3124: 20%
Gerstley Borate: 30%
Nepheline Syenite: 20%
Copper Carbonate: 5%
Raku Pottery Glaze: Forbes Midnight Blue
Midnight Blue is a rich cobalt blue with red streaks in post firing reduction. Stay tuned for this month's pot which features previous glazes of the month: Blue Moon, Lime Green and Sassy Fat White/Silver Slither, in addition to this month's Midnight Blue.
Forbes Midnight Blue Glaze
Frit 3110 68%
Custer Feldspar 18%
EPK (Kaolin) 9%
Lithium Carbonate 5%
Copper Carbonate 4%
Cobalt Carbonate 2%
Hectorite 2% (or Bentonite 1%)
Raku Pottery Glaze : Forbes Sassy Fat White
With Silver Nitrate added I call this glaze Silver Slither, which is pictured. This glaze has to be fired hot to about 1950F for the platelets to form beads. it looks different on top of a variety of base glazes as you can see from the photos. Works best on shoulder of pieces or on a more horizontal surface. Mix on the thick side. I usually apply a very small amount at a time by either pouring or brushing. When I pour it, I often will blow on it to move it around.
Raku Pottery Glaze Recipe
Frit 3110 85%
Nepheline Syenite 5
EPK 10
Add:
Tin Oxide 7
Magnesium Carbonate 34
Hectorite 2 or Bentonite 1
Optional: Silver Nitrate 2
April Glaze : Lime Green Crackle
RAKU POTTERY GLAZE RECIPE
Frit 3110 58%
Frit 3269 10
Nepheline Syenite: 22
EPK (Kaolin) 5
Silica 5
Add:
Chrome Oxide .4 (point 4)
Tin Oxide 3
Hectorite 2 or Bentonite 1%
This month's glaze is a revision of my March Glaze called Lime Green Crackle. Stay tuned for a silver glaze recipe next month!
This glaze is fired to 1900 degrees F, pulled from the kiln and reduced in a small can with newspaper. Lid is put on immediately. Wait about 2 1/2 minutes and remove the lid. Rub the top of pot with torn newspaper using gloves. Once paper ignites cover can again immediately and let cool (you may have to use a torch to reignite the paper).