Phyllis Tilton on fri 4 feb 05
Candace: When at the San Diego NCECA, I bought a beautiful and colorful mask at a shop in Balboa Park. At first, I thought it was glass because it looks like glass. It is very thin ceramic with fumed metals. There was a small description of the process--
Kosai Ware- translated to mean 'hue of light'.
This is a Japanese term for a technique of vapor fuming. The vapor is attracted to prescious metals, thus producing a subtle to brilliant rainbow of iridescent colors. Unlike the raku process, the brilliance of a kosai glaze is considered archival, meaning that it will not fade over time.
The artist : Carol Ratliff, San Diego, Calif.
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Maybe someone else will know more about this. I haven't taken the time to research it other than look is several books. I have wondered or imagined how this would be done --the glaze would be metalic but what is the content of the fumes? A good tight mask and exhaust system would be essential, too. Or would it be done in a saggar atmosphere??I would never be able to do this but treasure this gorgeous mask addition to my collection.
Phyllis Tilton
daisypet1@yahoo.com
daisypet@aol.com
Charter Member Potter's Council
Ivor and Olive Lewis on sat 5 feb 05
Dear Phyllis Tilton,
This topic has been discussed before. Workshops are sometimes
advertised in CM.
As I understand the process the object of the exercise is to bring the
ware up to the stage where the surface of the glaze becomes reactive,
in the 550-700 deg C range for mature stoneware glazes, then to spray
salts of Gold, Platinum, Palladium and other noble metals as aqueous
solutions into the kiln.
Give that Gold bullion runs at about $US 450 per ounce troy, Platinum
about %US 850 per troy onz, (about 30 grams) and that their soluble
salts are even more expensive there may be some restrictions on the
process.
Other people may have more information.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
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