Electric Mid&Hi Fired Ceramics
Potters & Sculptors - Making Rock from Mud
DSCF5745
Comment
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Comment by Robert G. Brehmer on March 26, 2014 at 4:28am
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the glazes I used on this pot are fired to cone 3 in an electric kiln
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Comment by Norm Stuart on March 25, 2014 at 9:00pm
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This is a sample of Oil Spot made by Kathy Ransom. She has the recipe in the Insight Database as "Oil Spot Overcoat".
This is the top coat mixed with Praseodymium Yellow with Black Iron Oxide in the base coat which is far too runny in this early sample, and slow-cooled. I think they work better over a typical high iron oxide glaze like Orange Street - also in the Insight Database.
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Comment by Lawrence Weathers on March 25, 2014 at 7:44pm
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I'm a little confused by your last paragraph. If I understand what you're saying, the greater fluidity of the bottom glaze causes the top glaze to slide. then you say that you have thickened this fluid bottom glazes and it works better.
That seems to contradict your first statement but I'm probably just misunderstanding something here
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This should be nearly identical in concept to cone 6 "oil spot glazes" whose mechanism is supposedly different to cone 10 oil spots.
http://www.flickr.com/photos/glazes/sets/72157605126678933/
Simply applying one glaze over the other and thermal currents at melt temp stir the glazes. The mechanism in cone 10 glazes has been alleged to be red iron oxide losing oxygen, becoming black iron oxide and the oxygen rising to the surface carrying some of the underlying glaze with it. I'm not completely sold on this proposed action at cone 10.
In many of the cone 6 oil spot glaze combos, the glaze underneath is far more fluid at melt, resulting in the top layer sliding-off on vertical surfaces, so I've thickened these glazes, making them more refractory with better results.
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I look forward to your response to my questions about the bowl
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this is the same black and white glaze interaction that I explained in the photo of the bowl with the colored glazes that are poured over the black to make a lava-like effect
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could you explain how this is done?
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