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Showing results for tags 'cone 5 glazes'.
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I have a question on "holding" time with an electric kiln. One of the glazes I use fires matte at cone 5 and glossy at cone 6. I would like something just slightly more cone 5. If I set the kiln for cone 5 and set it hold for an hour at the peak temperature, will I get a slight temperature increase? hold it for more? less?
I have a nice size bowl ( 12" wide, 5 inches in height). Bisque fired to cone 04, glazed fired to cone 5, commercial glazes ( amaco potter's choice) I liked the shape, the glaze turned out great.... but after the glaze firing there was a noticeable crack on the bottom, inside the foot. The crack did not go through to the glaze on the inside of the bowl. I have repaired bisque ware before with paper clay.... so I thought I would try it. I refired at cone 04. My thinking was i just wanted to get the paper clay to the bisque stage but not risk defects on the surface of the glaze. The paper clay worked great. The glaze color was much subdued but still beautiful. A little bit of a gold sheen in the glaze. The glaze surface was fine. The commercial glaze is food safe when fired to cone 5. Should I worry about a difference in the food safe quality of the glaze because of the retiring to a lower temp.? The bowl is certainly large enough that no one is going to eat cereal out of it... but I am hesitant to sell it with my other functional work? what do you think?