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Comment by Denice E. Demuth on November 18, 2013 at 3:10pm

Nice glaze combination.   Denice

Comment by Norm Stuart on November 11, 2013 at 10:20pm

I wish I understood the mechanism of these gold/black colored manganese saturation glazes better.

Black Manganese Dioxide (MnO2), the primary component in dry cell batteries, decomposes into green Manganese Monoxide Mn(II)O, at 995 F.

Manganese, stripped of the oxygen in a reduction firing, would melt around cone 8. But Mn(II)O remains stable without evaporating until well above cone 12. In a glaze melt, Mn(II)O acts as a strong base - but is not a strong base or reactive at room temperature. It was one of the first natural pigments used in cave paintings and body decoration.

Somehow this green base compound combines with iron oxide, cobalt oxide, and copper oxide to create either matte black or reflective gold. Adding tin oxide makes the black blacker and the gold golder.

Sharply reduce the level of manganese to a level roughly equal to the level of the iron, cobalt and copper and the glaze color turns out silver.

Iron with Manganese alone forms a nice black glaze, while Tin with Manganese yields brown. Manganese Silicate without alumina is purple, as is Manganese with Cobalt.

What is the structure of these silver and gold reflecting compounds? Someone must know.  Not I.

Comment by Tim O'Neill on November 11, 2013 at 5:19pm

Hey George - This was the queen of the kiln.  I resorted to commercial glazes for this one.  It was fired to cone 6 in elctrick ox - Metallic Saturation glaze on rim that flowed into the Textured Turquoise over Blue Rutile  (Amaco Potter's Choice glazes) - The red band is chattered with a RIOX wash (no glaze).  I've been able to reproduce the results on a similar pot.  These glazes are very predictable once the palette is built.

Comment by George Lewter on November 11, 2013 at 5:06pm

What is that black glaze around the rim and inside. It has a nice satin sheen.

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