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Black Lustre  (Low Fire Earthenware Raku)
Colemanite (Gerstley Borate) 75.00
Nepheline Syenite 25.00
Total 100 %
15.00% Copper Oxide (Black)  
15.00% Black Iron Oxide 559910  
3.00% Bentonite  
This a nice raku glaze but it will lose its luster over time.  
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