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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.

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Guest JBaymore

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.





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