katalayne Posted January 1, 2011 Report Share Posted January 1, 2011 I fired my small kiln and pieces are still pinging 36 hours after being removed from the cooled kiln. I fired to 05 as glaze was rated. The clay was rated to fire to cone 10. I am a newbie and this my experience with pinging other than raku. What causes this pinging? Link to comment Share on other sites More sharing options...
Chris Campbell Posted January 2, 2011 Report Share Posted January 2, 2011 Pinging after firing is the sign of a bad fit between the glaze and the clay body. They are shrinking at different rates and the glaze is cracking. In raku, this is good news. In functional wares it is a bad sign If it was a white pasta bowl it would not be white very long! Good glaze fit is not going to happen when you put a Cone 05 glaze on a clay body that matures at cone 10. You have to have a cone 05 glaze on a cone 05 clay body ... Or a cone 10 on a 10. Good glaze fit is hard to do ... Keep learning and reading and testing. Link to comment Share on other sites More sharing options...
katalayne Posted January 2, 2011 Author Report Share Posted January 2, 2011 Pinging after firing is the sign of a bad fit between the glaze and the clay body. They are shrinking at different rates and the glaze is cracking. In raku, this is good news. In functional wares it is a bad sign If it was a white pasta bowl it would not be white very long! Good glaze fit is not going to happen when you put a Cone 05 glaze on a clay body that matures at cone 10. You have to have a cone 05 glaze on a cone 05 clay body ... Or a cone 10 on a 10. Good glaze fit is hard to do ... Keep learning and reading and testing. Thanks. I wondered if that was the problem. I have not had a problem with other firings, but this was the first time with a low fire glaze. I had been using a cone 5-6 glaze. Since these were small test pieces there is no problem and I learned a valuable lesson. Again, thanks for the info. Link to comment Share on other sites More sharing options...
Deb Evans Posted January 2, 2011 Report Share Posted January 2, 2011 if you want to see what's happening to the glaze - soak the test pieces in strong solution of black tea ( 2 bags + 1/2 cup hot water- 24 hrs or so) and voila - the crazed lines will appear! neat for non-fuctional ware but bad fitting glaze to clay is not very healthy for functional work. Link to comment Share on other sites More sharing options...
Marlena P Posted January 2, 2011 Report Share Posted January 2, 2011 I fired my small kiln and pieces are still pinging 36 hours after being removed from the cooled kiln. I fired to 05 as glaze was rated. The clay was rated to fire to cone 10. I am a newbie and this my experience with pinging other than raku. What causes this pinging? Pinging can go on for years! I made a piece that pinged on my dining room table for over a year- it was quite a conversation piece... Usually it implies that the glaze does not "fit" the clay. It also happens if you fire a clay at a different temperature than for what its formulated. Hope that helps. Link to comment Share on other sites More sharing options...
Pres Posted January 19, 2011 Report Share Posted January 19, 2011 I fired my small kiln and pieces are still pinging 36 hours after being removed from the cooled kiln. I fired to 05 as glaze was rated. The clay was rated to fire to cone 10. I am a newbie and this my experience with pinging other than raku. What causes this pinging? Pinging can go on for years! I made a piece that pinged on my dining room table for over a year- it was quite a conversation piece... Usually it implies that the glaze does not "fit" the clay. It also happens if you fire a clay at a different temperature than for what its formulated. Hope that helps. I remember one of my grad classes in the summer I made 150 pots during the summer session at Penn State. When all done, I stored them in my bedroom. One week of that and they went to the back porch as I couldn't sleep at night. Over the course of 2 years they almost all disappeared! Occasionally I will walk into someones home and see a pot prominently displayed-a back porch appropriation-I say nothing! Link to comment Share on other sites More sharing options...
meisie Posted January 28, 2011 Report Share Posted January 28, 2011 I fired my small kiln and pieces are still pinging 36 hours after being removed from the cooled kiln. I fired to 05 as glaze was rated. The clay was rated to fire to cone 10. I am a newbie and this my experience with pinging other than raku. What causes this pinging? Pinging can go on for years! I made a piece that pinged on my dining room table for over a year- it was quite a conversation piece... Usually it implies that the glaze does not "fit" the clay. It also happens if you fire a clay at a different temperature than for what its formulated. Hope that helps. I remember one of my grad classes in the summer I made 150 pots during the summer session at Penn State. When all done, I stored them in my bedroom. One week of that and they went to the back porch as I couldn't sleep at night. Over the course of 2 years they almost all disappeared! Occasionally I will walk into someones home and see a pot prominently displayed-a back porch appropriation-I say nothing! You mean people walked by and put a few in their pockets for home? I would (sorta) like if people did that to me at this stage. :-) It would let me know if I'm on the right track. If they don't want to take one then perhaps I need a new hobby. Link to comment Share on other sites More sharing options...
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