[Sca-cooks] OT OOP tedious process-Raku
Etain1263 at aol.com
Etain1263 at aol.com
Mon Nov 12 04:01:25 PST 2007
In a message dated 11/12/2007 1:43:06 AM Eastern Standard Time,
StefanliRous at austin.rr.com writes:
Ummm. I'm not rich enough (or knowledgeable enough about pottery
firing) but if you used pot instead of straw, would you get a
different glazing effect?
The reason you use the "dry matter" was to form a reducing atmosphere (the
burning "stuff" used up all the oxygen) which made the coloring matter in the
glazes (usually metal salts) become their form that had one less oxygen (-ous
to -ic for you chemists). This form was usually more highly colored.
Although, Iron turns from that nice rust color we all know to a color similar to
a young sage leaf. Copper, otoh, turns from that chalky green color to a
lovely blue!
Etain..chemist in RL
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