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Bisque Temperature Questions


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I have always bisque fired to ^06 but have recently begun doing some "naked raku" for which bisque firing to ^010 is recommended. I have tried both, and the naked raku results for pieces bisqued to ^010 are nicer. My question is, how will pieces bisqued to ^010 behave in high fire (^10 gas reduction)? I would like to avoid having to conduct separate bisque firings, but I haven't been brave enough to try glazing and firing these ^010 bisqued pieces in high fire. Thanks in advance for your help!

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I think it will depend on your clay body. A higher bisque temperature burns off organics and other "nasties", e.g., clay with manganese etc. You need a higher bisque temperature to get rid of those parts. If not burned out during bisque, they could affect your glaze results . . . blisters or other surface faults.

 

Sometimes a lower temperature bisque is desired . . . I recall some who use porcelain and carbon trap shinos like a softer bisque because it allows the soda ash to permeate the walls more easily and create carbon patterns.

 

 

You will have to adjust your glaze thickness/application with a softer fired bisque. Softer bisque is more absorbent.

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