This is about 1/2 gallon of glaze with 150 grams of yellow stain ready to mix in. That stain retails for about $30 so its cost alone is about $60 for each gallon (in 2017). But the incredible color it produces cannot be done in any other practical way.
This is a type of stain manufacture that enables the use of metal oxides (like cadmium) under temperature conditions in which they would normally fail.
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