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So, I am a new high school art teacher who is in charge of the school's ceramics classes. When I was going through my classroom supplies, I learned that we have cone 6 clay, but all of our glaze is cone 06-04... SOS. What is the best way to use the supplies I have, when ordering new supplies at this time is not an option? I figured I could only fire the clay to cone 04, but then the work won't be as strong. Could I fire the clay to cone 6 as a "bisque" then follow it with a cone 04 glaze fire? Thank you in advance for any help offered!!!
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As others have suggested, definitely make sure your clay is indeed Cone *6* not *06*.
It would be odd to have a mid fire Cone 6 clay body and then low fire glazes.
If those low fire glazes are fired up to Cone 6 they are going to run everywhere.
If the clay is indeed Cone 6, then perhaps the previous teacher purposely underfired it, and used the low fire glazes. I would almost guarantee this was the case based on the low fire glazes.
What kind of kiln controller do you have? Is it a digital controller or a kiln sitter? I ask, because if it is a kiln sitter you'd likely be able to see what cones the previous teacher was firing to.