Gerstley Borate 57%
Synthetic Bone Ash 19
Nepheline Syenite 10
EPK 9
Silica 5
Add:
Copper Carbonate 8
Cobalt Carbonate 2
pottery glazes
Raku Pottery Glaze: Forbes Copper Satin Matte, Variation 2
50 Gerstley Borate
20 Frit 3269
15 Nepheline Syenite
15 Lithium Carbonate
Add:
17 Synthetic Bone Ash
6 Tin Oxide
5 Copper Carbonate
1 Cobalt Carbonate
Photo is of two test tiles both fired in the same kiln to 1875 degrees F and reduced in the same 10 gallon can with 6 sheets of newspaper (3
torn into strips). Lid was placed on the can immediately which produced a medium reduction. Can was not burped and tiles were left
to cool.
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%