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Showing results for tags 'firing issue'.
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I have been having a strange issue with my Cone 6 Black Stoneware Clay from Standard (266). It gets these big cracking bubbles upon glaze firing. I bought this clay to marble with Porcelain (Standard 365) because it had a similar shrink rate. The marbled pieces came out SUPER bubbly, really horrible. I thought it was just poor clay preparation on my part because of the mixing of the two. However it has been happening with pots I make solely out of the Black Stoneware. I prepare this clay the same way I do all my other clay bodies and never really have this issue otherwise. Has anyone else had this problem with this clay? Any advice?
Searched around for similar posts and only found one. So I’ve been gifted a large wooden table with a particle board top that I’ve been using for wedging. As of late lots of little bits of the particle board are getting stuck to the clay when I’m rolling out for hand building. They aren’t deeply embedded but deep enough that I’d mess up my pieces if I tried to wash them out. I’m using a sandy buff stoneware from standard ceramic (509). These pieces are going to be a bit more rustic in look so I won’t mind if there are tiny divots after firing, but my main concerns are 1) Will it negatively affect the kiln at all (I use someone else’s) and 2) will it affect how the glaze takes (I can never attach a photo as it always says they are too large...any tips for that as well?) thanks friends!
I have been having an issue with the bottoms of my pots getting big chips out of them during a glaze firing. The chipped parts are not really stuck the the kiln shelf, they brush off easily, so I don't think it's a glazing issue. Normally I dip glaze pots with clear and wipe off the bottom with a sponge. I wonder if a little residual glaze is still there and sticking? This is happening with my cone 6 porcelain (standard 365) and a black stoneware clay. Both have a high shrink rate. I do use kiln wash. Do I need to apply kiln wash for every firing? It seems like that must be the issue but on some shelves the wash is getting so thick that it flakes off. Should I be removing the excess and re applying fresh kiln wash?