WednesdayBean Posted April 23, 2016 Report Share Posted April 23, 2016 I have cone 6 clay and cone 6 glazes, but my digital kiln firings recently began ending with FTL (fired too long, meaning it never reached temperature and shut off after stalling for 3 hours). The bowls look pretty good, although the colors aren't maturing like they used to. I put cones 5, 6, and 7 in to see what's really going on and none of them bent in the slightest. Assuming the bowls only fired to a cone 4 or below, are they still okay to use? What would be the main problem with an under-fired bowl? The last recorded temperature on the computer was 2050, so it may have only gotten to Cone 1! I'm sure my kiln needs repaired but I wondered if the bowls I have will need to be fire again, or if I can just use them as is. Thanks! Link to comment Share on other sites More sharing options...
Mark C. Posted April 24, 2016 Report Share Posted April 24, 2016 Fix kiln and retire them I suggest not using them until the clay is vitrified at cone 6. Link to comment Share on other sites More sharing options...
Biglou13 Posted April 24, 2016 Report Share Posted April 24, 2016 yeh what ^^^. He said.... Immature glazes my leach...... Clay is not vitrified may retain things you don't want retained..... I suppose you could use them as a flower pot. Or to hold wrapped candies......... But I'd be weary eating out of them.... It's possible the structure will be weaker.... I can heat dads around the world, and hunter s Thompson .. Anything worth doing is worth doing right Link to comment Share on other sites More sharing options...
rayaldridge Posted April 25, 2016 Report Share Posted April 25, 2016 I would think the main problem with severely underfired midrange stoneware would be leakage, if (probably when) the glaze crazes. Link to comment Share on other sites More sharing options...
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