Posted 05 February 2014 - 02:35 PM
Posted 05 February 2014 - 02:52 PM
Well, I haven't intentionally done it, but one time, I didn't get enough reduction with some of the glazes. The Lusterous Copper by Amaco, was more of a dark blue green, in oxidation. That makes sense, as copper oxidizes green.
The other colors I use, don't look a whole lot different, other than the lack of the "smokey" spots.
Posted 05 February 2014 - 03:04 PM
They just come out their plain un-reduced colors, typically green for the flashy copper glazes, with no metallic effects. For glazes that don't flash in the post firing reduction you won't see much difference.
Kiln Repair Tech
L&L Kilns Distributor
Owner, Neil Estrick Gallery, LLC
Posted 05 February 2014 - 03:21 PM
Because they are often formulated for fast up firing cycles and no slow cooling cycle, they can sometimes end up being runny in a slow firing to the end point temperature that they typically reach in a raku firing. Remember the concept of heat work. It is not JUST about end point temperature. If they are "right" for rapid heating up to X degrees....... they are likey overfired at slow heating up to that same X degrees.
Adjunct Professor of Ceramics; New Hampshire Insitute of Art
Former Guest Professor, Wuxi Institute of Arts and Science, Yixing, China
Former President and Past President; Potters Council
Posted 05 February 2014 - 03:47 PM
Posted 05 February 2014 - 07:42 PM
Contemporary Fine Colored Porcelain
>TRY ... FAIL ... LEARN ... REPEAT"
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