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Pottery/Fired cone 05-06 glaze at 04


QUESTION: I'm currently holding my breath b/c I fired a kiln at 04 by accident & did not realize it until it was too late. The problem is that the majority of the glazes recommend to be fired in an 04 bisque (which it was) & glazed fire to be 05-06. These are pieces for clients & I'd like to know what could potentially happen to the colors as a result.

ANSWER: Dear Alach,

Thank you for your recent question. Since you only fired to cone 04, then re-fire the pieces to cone 05-06, the original maturing temperature. They will turn out fine.

I hope this answers your question. If you have further questions, please feel free to contact me again any time. I am always at your service.

Ms. Ti Phillips
Earth Stoke 'N Fire Pottery Studio and Artist Retreat

---------- FOLLOW-UP ----------

All pieces survived but the ones that were damaged were the warm or darker pinks. It became a blotchy diluted purple, is there a way to salvage those by refiring to 05? Or once the color is burned off (which is what I think happened), I just have to start over? Plus isn't 04 temperature hotter than 05-06, wouldn't I be burning more of the color off by doing another fire of 05-06?

Dear Alach,

Thank you for your follow up question. Yes, you are correct. Cone 04 fires hotter than cone 05. What you should do is to re-apply the glaze before re-firing. Use a heavy grit sand paper to etch the current glaze and then re-glaze. Then re-fire to cone 05. This should cure the problem with the over fired ware and the color should come out as it is suppose to.

If you have problems getting the glaze to adhere to the ware, add a little honey and vinegar to the glaze.

I hope this answers your question. Let me know how your ware turns out. Always at your service.

Ms. Ti Phillips
Earth Stoke 'N Fire Pottery Studio and Artist Retreat


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Ti Phillips


Will answer any questions on hand building, wheel, glaze, firing. Speciality questions to include those in glaze calculation and development, firing techniques. Please do not send questions on identifying pottery. Although I would love to add this to my question topics, I have a retreat to run as well as the studio and volunteering on AllExperts, and therefore do not have the available time to research indentification and marks. Thank you for understanding.


Experience includes 30 years in pottery design and education. Have taught online and studio classes worldwide for the last 20 years. Own a pottery retreat specializing in firing techniques. Have 12 years solid experience in glaze calculation and formulation as well as problem solving in glaze chemistry. I am the first potter in the United States to have developed a complete package of pottery equipment blueprints for a studio. The blueprints include wheels, kilns, studio furniture, wedgeboards, raku kilns, slab rollers, ball mills and studio tools.

Alliance of Pottery Artists Worldwide Association

Ceramic Industry - PPP Wyndstryder Press - Pottery Journal

University of Sciences and Art's of Oklahoma, studied under Professor Jaymes Dudding.

Awards and Honors
Potter of the year with APAWA, various awards for showmanship and design.

Past/Present Clients
Available upon request.

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