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Pottery/Re-Firing Under Fired Pottery


Hi Ti,

I accidentally fired a glaze firing at 05 instead of 5.  When I opened up the kiln after the firing, the Sahara brand clear glaze that went on white was still white on all the stoneware pieces!  Yikes!  Can they be re-fired to cone 5?  Do I need to do anything to them except close the lid and try again at cone 5?  
Thank you so much in advance for your help!

Dear Laura,

    Thank you for your recent question. Yes, you can re-fire the ware by doing a complete firing set to mature at Cone 5. Under firing does not change the ware in any way other than removing all of the chemical water from the glaze. Because the glaze did not reach maturing temperature, you just need to bring it up to the maturing temperature to get the glaze to melt as it would have. So go ahead and re-fire the kiln, setting it to Cone 5. Your ware will fire just fine.
    I hope this answers your question and if you have further questions, please feel free to contact me any time. I am always at your service.

Ms Ti Phillips


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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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