Cindy P Posted September 3, 2022 Report Share Posted September 3, 2022 (edited) prefired glazed bisque New potter here. Doing my second glaze. Pre firing The stroke and coat I used on my fired white body earthenware is covered with a complete network of tiny bumps. Kind of attractive but certainly not normal. May not have waited long enough between coats. Or gone too thick. Thanks. Edited September 3, 2022 by Min Title edit by Min for clarity of topic Quote Link to comment Share on other sites More sharing options...
Roberta12 Posted September 3, 2022 Report Share Posted September 3, 2022 Hi @Cindy P Welcome to the forum. Could you post a picture of your piece with the bumps? Can I ask why you are pre firing a glaze? Roberta Quote Link to comment Share on other sites More sharing options...
Cindy P Posted September 3, 2022 Author Report Share Posted September 3, 2022 Quote Link to comment Share on other sites More sharing options...
Cindy P Posted September 3, 2022 Author Report Share Posted September 3, 2022 (edited) Hi Roberta, I have posted a picture. I was trying to indicate I was firing on bisque not bone dry clay. Thanks so much for your help. Edited September 3, 2022 by Cindy P Addition Pres 1 Quote Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted September 4, 2022 Report Share Posted September 4, 2022 What clay body are you working on, and what temperature were the pieces bisqued to? Also, what temperature was the pre fire done to? Roberta12 and Pres 2 Quote Link to comment Share on other sites More sharing options...
Cindy P Posted September 4, 2022 Author Report Share Posted September 4, 2022 I am working on Activa blackjack low fire earthenware fired to cone 06 by a teacher I was working with. I will be firing to 05 or 04 in the future at home based on some reading I have done. I have been firing my glazes at ramp 300 to 180 hold 10 minutes ramp at 200/300 to 1820 hold 15 minutes. This will be my 4th firing. I am having so much fun ! Callie Beller Diesel 1 Quote Link to comment Share on other sites More sharing options...
Cindy P Posted September 4, 2022 Author Report Share Posted September 4, 2022 Kelly in AK 1 Quote Link to comment Share on other sites More sharing options...
Cindy P Posted September 5, 2022 Author Report Share Posted September 5, 2022 Here is the outcome of my firing. Love the back mixed melon not so sure about what I put the inside. Some of the bumps created little pinholes (proper term?) next time I will use mixed melon judiciously on the edgers with slime time. Quote Link to comment Share on other sites More sharing options...
Cindy P Posted September 5, 2022 Author Report Share Posted September 5, 2022 Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted September 5, 2022 Report Share Posted September 5, 2022 (edited) On 9/4/2022 at 10:23 AM, Cindy P said: I have been firing my glazes at ramp 300 to 180 hold 10 minutes ramp at 200/300 to 1820 hold 15 minutes Just a question, do you fire with witness cones? I ask because the firing schedule you use is a bit unique and does not really follow the Orton cone methodology that generally gets you to a certain cone. It’s hard to know what these were fired to looking at your schedule. A normal maturing ramp for the last 200f of firing would be 108 degrees per hour. Yours may have been double or triple this speed which could mean you fired more like 07. It’s hard to know. I also mention it because you are pondering firing to 04, so maybe learning how Orton cones predictably drop will be something you explore and prove helpful. So do you use witness cones and what cone was this fired to? Edited September 5, 2022 by Bill Kielb Quote Link to comment Share on other sites More sharing options...
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