Electric Mid&Hi Fired Ceramics
Potters & Sculptors - Making Rock from Mud
IMG_4930
Comment
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Comment by Norm Stuart on May 11, 2015 at 12:44pm
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I'd suggest refiring the green vase.
With a digital controller we always add a 20 minute hold after the controller indicates Cone 6 heat-work has been done. While in theory I think this accumulates a Cone 6.5, the reason we do it is to allow glaze reactions to finish and lay down. This may be more a problem for our kiln as it can achieve the final climb to 2,232 or so very quickly.
If your "speckles" are bubbles or pin-holing, a hold at temperature usually cures this. For us the exceptions which are not cured by a hold have been porous cone 10 clays fired at cone 6 with a reactive glaze which have penetrated deep into the clay body, or the rare occasion where the glaze reacts chemically with the clay. When this happens I have the ware refired to help understand what's happening. Some of these rare interactions continue into the third Cone 6 firing.
Your "speckles" can also be crystallizations, which we frequently see in our glazes doing a 6 hour slow-cool between 1,800 F and 1,500 F.
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Comment by Trish Eckman on May 11, 2015 at 9:07am
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Do you think the speckles on the green one are because it was underfired?
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I think I under-fired a bit also. ^6 barely bent. The glossy black wasn't very glossy.
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It amuses me to watch some people spend a lot of time on some piece then immediately slather on some glaze without first firing it on a test tile of the clay they're using.
Most glazes take on a variety of looks depending on which clay they're used on.
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ha ha, I know what you mean , the frogskin turned out terrible for me as well. I had such high hopes for it!
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Nope, I wanted to make sure that the glazes worked. I'm glad I waited. The frogskin turned out terrible. I liked the Honey Amber, Rowes brown, Strong Celadon and Fat Cream though.
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did you get this glazed in your last load?
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Comment by Cyndy Littleton on April 16, 2015 at 11:58am
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Please post pics when you finish!!
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