glazes

Glazes

Taking a cue from an old geology book on volcanoes, I came across a passing reference to a volcano in eastern Oregon that produced purple and blue geodes. This reference lead me to believe that different volcanoes produce different colors. Following this line of thought I began formulating glazes out of volcanic ash on the assumption that Mt. St. Helens would be different from Mt. Hood would be different from Mt. Mazama would be different from some random volcano in central Oregon, and to some extent they are. I especially enjoy creating my own glazes, using native materials whenever possible. Mt. Hood volcanic ash collected off the side of the mountain is high in some kind of heavy metal, thus a cobalt glaze from Mt. Hood will have black streaks; whereas volcanic ash from Mt. Mazama, (Crater Lake) collected about 50 miles from the explosion, will have a very low heavy metal content, and be slightly different in color. As for my theory that different volcanoes produce different colors; it holds true to the extent that distance effects color; but one can also infer that different volcanoes have different volcanic compositions.

Copper Carbonate in Crater Lake ash with a red glaze underneith email for an update	Copper Carbonate in Crater Lake ash, but with one variation to the glaze. The result is a yellow instead of redish color. email for an update	Cobalt in Crater Lake ash with a purple glaze inside email for an update

A thin application of red copper carb, the red and purple are able to show threw nicely. email for an update	Cobalt and blue. email for an update	The blue for this piece came from a "blackberry" color mason stain that went flat, or never was good to begin with. It does produce a nice color when done right. email for an update

The way the manganese and cobalt break over edges produces the same iron color. The two colors when used together on a piece work very well together. Spooky how awesome they blend email for an update	Another sample of manganese and cobalt. email for an update	When you put on three layers of color, really nice things develope. This piece has purple with a thin layer of copper with another layer of copper on top of that. email for an update

Red with a thin layer of copper and maybe another layer of copper. email for an update	Copper carb in vocanic ash with a black tin ox. on top. email for an update	A perfect balance of red inside highlighting how the copper breaks red, and yellow outside highlighting the yellow colors in the copper. email for an update