Juli Long Posted November 20, 2011 Report Share Posted November 20, 2011 If you can top this for a bad firing I will send you one of these mugs!! Post your pictures of your firing miss-haps! Buckeye, one of these was for you! Just out of the kiln with many more just like it. Link to comment Share on other sites More sharing options...
Denice Posted November 20, 2011 Report Share Posted November 20, 2011 I have never had this bad of firing but I have seen two worse ones. The first one was in high school and the teacher left the kiln on over night and the low fire vases melted into puddles, it was his personal work I think he smoked to much MJ that night. The my second one was in college, it was the last firing of the year and a friend of mine put some low fire pieces in a reduction cone 10 firing. They melted like glass all over a hundred pieces in the kiln, I didn't loose anything I always fired my own work at home. It could have been worse. Denice Link to comment Share on other sites More sharing options...
buckeye Posted November 20, 2011 Report Share Posted November 20, 2011 I LOVE the color.. what happened?! I think it is awesome you are doing this. I wish I would have taken some pictures of my firing mishaps.. I could easily beat that! My very first firing went great and everything turned out good. My second firing EVERYTHING but one piece broke! another time I was firing after glazing and a piece fell over and everything on the bottom shelf was fused together! Denice.. is there really such a thing as TO MUCH MJ?? Link to comment Share on other sites More sharing options...
OffCenter Posted November 20, 2011 Report Share Posted November 20, 2011 Denice.. is there really such a thing as TO MUCH MJ?? I gave you a plus 1 rating for that! Link to comment Share on other sites More sharing options...
Juli Long Posted November 20, 2011 Author Report Share Posted November 20, 2011 Buckeye, The color on these particular mugs was "Duncan renaissance, antique celadon". Brushed two coats then a third random criss/cross on them. Slow bisque to cone 04. I have a Vent-sure downdraft vent on ,and the kiln is new. Used Armadillo clay, (cinco blanco) cone 5 clay. The glaze is a cone 5/6. Slow glazed to cone 5 with a 15 min. soak normal cool. Re-fired the whole kiln load to cone 5 with a 30 min. soak. No change. Same thing happened with other Duncan glazes and Amaco potters choice glaze and Mayco dry mixed glaze. Three pots in the same firing were B-mix 10 clay with same glazes and they turned out fine. My GUESS is the Armadillo clay and all the glazes did not work together at that temp. Blisters and craters everywhere and colors that were off. I will have to explore this further........or not. Denise, Knock on wood! Juli Link to comment Share on other sites More sharing options...
Pres Posted November 20, 2011 Report Share Posted November 20, 2011 Buckeye, The color on these particular mugs was "Duncan renaissance, antique celadon". Brushed two coats then a third random criss/cross on them. Slow bisque to cone 04. I have a Vent-sure downdraft vent on ,and the kiln is new. Used Armadillo clay, (cinco blanco) cone 5 clay. The glaze is a cone 5/6. Slow glazed to cone 5 with a 15 min. soak normal cool. Re-fired the whole kiln load to cone 5 with a 30 min. soak. No change. Same thing happened with other Duncan glazes and Amaco potters choice glaze and Mayco dry mixed glaze. Three pots in the same firing were B-mix 10 clay with same glazes and they turned out fine. My GUESS is the Armadillo clay and all the glazes did not work together at that temp. Blisters and craters everywhere and colors that were off. I will have to explore this further........or not. Denise, Knock on wood! Juli Maybe you need to bisque at a higher temp to remove gasses? Link to comment Share on other sites More sharing options...
Juli Long Posted November 20, 2011 Author Report Share Posted November 20, 2011 Pres, Could you suggest another bisque temp. if not slow cone 04 please. 03 or 02 ? thank you Juli Link to comment Share on other sites More sharing options...
GEP Posted November 20, 2011 Report Share Posted November 20, 2011 Juli, do you have a witness cone that says your kiln fired to cone 5? To me the pots look overfired. If the glaze worked better on cone 10 B-Mix, that also indicates the kiln may have fired higher than cone 5. If this is a new kiln, have you measured it with witness cones yet? I also think Pres's suggestion is a good one, I'm just offering another suggestion. Thanks for sharing, we all have humbling moments like these! Mea Link to comment Share on other sites More sharing options...
Marcia Selsor Posted November 20, 2011 Report Share Posted November 20, 2011 I agree with Mea. Looks like the kiln was too hot. I am using Armadillo clays without any problems. Marcia Link to comment Share on other sites More sharing options...
Juli Long Posted November 20, 2011 Author Report Share Posted November 20, 2011 Mea and Marcia,Yes, I did use cones, and they showed almost a cone 6 first firing and second re-fire both top and bottom shelve. Question: If the glaze can go to a cone 5/6 and I fired in that range, shouldn't the glaze look better? If I bisque hotter will the glazes take? I loved throwing with this clay so I hope I can figure this out. I will start with a higher bisque and no soak I guess. Thank y'all for the suggestions. Juli Link to comment Share on other sites More sharing options...
GEP Posted November 21, 2011 Report Share Posted November 21, 2011 Juli, if the glaze is rated for cone 5/6, and your clay is rated for cone 5, then an almost-cone-6 firing could indeed be too hot for that combo. I use a cone 5 clay and fire my kiln to 2185°F. When measured with witness cones it reads cone 5.5 on the top and bottom, and cone 5.75 in the middle. If I program my kiln just 10° higher, one of my glazes starts to blister like the blisters in your photo. Sometimes there's a fine line between what works and what doesn't work. If you are really motivated to continue using this clay/glaze combo, I would test fire it to cone 3 with no soak. Hopefully they will come out slightly underfired, and then you'll know the correct answer is somewhere in between, and it won't take too much more time to figure it out. Mea Link to comment Share on other sites More sharing options...
Juli Long Posted November 21, 2011 Author Report Share Posted November 21, 2011 Mea, That sounds like a good workable solution. I will post pictures when I do the next firing . Juli Link to comment Share on other sites More sharing options...
buckeye Posted November 22, 2011 Report Share Posted November 22, 2011 Mea, That sounds like a good workable solution. I will post pictures when I do the next firing . Juli I really like the mug, love the color.. hopefully next time they turn out great! Link to comment Share on other sites More sharing options...
buckeye Posted November 22, 2011 Report Share Posted November 22, 2011 Denice.. is there really such a thing as TO MUCH MJ?? I gave you a plus 1 rating for that! I didnt think anyone caught it or at least didnt want to respond! I was actually thinking it might take my rating down a bit Link to comment Share on other sites More sharing options...
Benhim Posted December 4, 2011 Report Share Posted December 4, 2011 Interesting that the glaze did this on one clay and not another. I'd bet pres is right, you could probably bisque to top temperature to get rid of outgasing problems, then fire the glaze. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.