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I bisque cone 6 porcelain to cone 04.  Then reheated to 1150F.  What I pull the pieces to lay on the horse hair I get about a 30% loss/.  Cracking rate.

i put the vessel on sand in the sun or on hardiboard. How do I improve my success with this type of firing.

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I just learned about that problem this weekend from Joe Frank McKee, a horsehair pro. The problem is that you're going too hot, and the pot is crash cooling through quartz inversion. Try heating to only 900 and you should have much better results.

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