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The blue second layer here is 5x20 cone 6 clear with 2% cobalt oxide and 5% rutile. The base black glaze is 5x20 with 4% Mason 6666 stain.
| Recipes | G1214M - 20x6 Cone 6 Base Glossy Glaze A recipe developed by Tony Hansen in the 1980s. Its was popular for the simplicity and how well it worked with chrome-tin stains. It was upgraded many times. | 
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