Kimmiko18 Posted October 19, 2020 Report Share Posted October 19, 2020 Posted just now On 12/4/2018 at 2:54 PM, liambesaw said: If you're compressing your bottoms well and not lettting water sit in the bottom, i would blame the clay. I've never heard of a firing process introducing cracks, my bisque casualties have always been massive and violent. If it were from stacking improperly I'd expect the crack to form on the rim instead of the bottom. If your facility has been recycling clay it might be losing too many fines and needs them replaced (glazenerd's recipe is I think 60% ball clay, 20% silica, 20% feldspar @ 1 cup per gallon of reclaim) I'd definitely ask the professor though, it's probably something they've seen before and can remedy. Hi, wondering if anyone can help I have a large bowl with a small 2cm crack from the rim, it has been bisque fired and what can i do to repair? I have a similar problem, but longer on another bowl. thickness of sides and rim all ok, it is hand built so i do try to compress as much as i can around the rim. Also where I’m having the firing down my work (and I guess others works) are coming out with black marks like dots on them, just wondering what that could be. Many thanks/‘ Link to comment Share on other sites More sharing options...
Mark C. Posted October 19, 2020 Report Share Posted October 19, 2020 Lip splits make it toast I'm afraid to say make another one, pots are not precious. Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted October 19, 2020 Report Share Posted October 19, 2020 In regards to the firing, is it in an electric or a gas kiln? Link to comment Share on other sites More sharing options...
Sorcery Posted October 19, 2020 Report Share Posted October 19, 2020 Could be a number of things creating the cracks. From forming to firing. Dots sounds like iron spotting. Sorce Link to comment Share on other sites More sharing options...
liambesaw Posted October 19, 2020 Report Share Posted October 19, 2020 Black dots sound like manganese spit to me. Does your studio allow speckled clays? Link to comment Share on other sites More sharing options...
Min Posted October 19, 2020 Report Share Posted October 19, 2020 15 hours ago, Kimmiko18 said: Also where I’m having the firing down my work (and I guess others works) are coming out with black marks like dots on them, just wondering what that could be. Post a picture, could be flecks of spalled thermocouple if it's not in a protection tube or bits from a rusty lid band or spitting from something in the kiln. Link to comment Share on other sites More sharing options...
Kimmiko18 Posted October 19, 2020 Author Report Share Posted October 19, 2020 I believe it is an electric kiln Not sure what other pieces are going in there and i am basically using the same clay (white raku) with a satin white glaze Has anyone tried Bisque Fix from Keane Ceramics? thanks Link to comment Share on other sites More sharing options...
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