I am having a few issues with my kiln.
Two bowls, same glaze. Left bowl on the middle shelf and right bowl on the bottom shelf. Only put a cone on the middle shelf as I forgot the bottom one. Got to cone 9 in the middle, I was aiming for cone 10 but firing and me have a few issues to sort out.
The bottom one looks under fired on half but has this really nice white speckle look on half. If I remember right, all the parts away from the elements of the kiln have this white, the half nearer the elements look under fired. The whole thing might just be under fired. I have never really understood that much what I am looking for that makes it the right kind of fired. Is my kiln much hotter in the middle than around the edge? Even the bowls on the middle shelf have this half and half look. I don't know if it is glaze or kiln related. Probably both.
The one from the middle is a lot more even but maybe still under fired. Got the nice speckle but a much more subtle white. There was only a small shelf after the middle which didn't cover any of the bowls.
Here is the glaze recipe, I have been messing around with the specific gravity so this was maybe a little thin for the glaze which is why they are not very white. I may have messed up the recipe a bit when trying to change it for the better.
I think I need to do a kiln full of glaze tests before glazing any more of my work.
Soda Feldspar = 10
Cornish Stone = 30
Quartz = 10
Dolomite White= 10.5
Whiting = 10.5
China Clay = 25
Tin Oxide = 2.7
Zinc Oxide = 4
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