Manganese Dioxide
Manganese browns have a different, often more pleasant character than iron browns. Manganese oxides can occur in a number of less common forms: (i.e. Mn2O 3, Mn3O 4, Mn2O7). Pure manganese dioxide is often added to clay bodies to darken their color (even to black), 10% or more might be employed. Of course, using it for this purpose at cone 6 ...
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