Raku-glazes I use

Metallic Black

Measures by weight
  Gertsley Borate   45.6
  Nepheline Syenite   73.8
  Barium carbonate   53.4
  Lithium carbonate   29.1
  Flint   73.8
  Kaolin (EPK)   24.3
  Manganese dioxide   30
  Black copper oxide   6
  Black iron oxide   12
  Cobalt carbonate   6

 

I have used this glaze for raku firing and for cone 5 firing in an electric kiln. Dramatic colorations happen to this glaze when used for raku firing. I have seen flashes of crimson to orange come from the reduction of this glaze. Best results seem to come when the piece is partially submerged in a flammable material for a couple minutes before closing the reduction container.

This glaze has a broad temperature requirement and can be fired with any of the other glazes I use with very little difference in the final results.
             
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