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Showing results for tags 'pitting'.
Hello, I am a new member (and new to pottery in general) and have struggled to find the answer to the glaze defects I have been experiencing on previous posts in this forum. I am having trouble with pinholing/pitting/airbubbles (not sure exactly what to refer to it as). Most of my glazed pottery either has loads of little holes (this is especially bad with black underglaze topped with clear) or lots of tiny bubbles trapped beneath the surface. To provide a background, the clay I have been using is Scarva Earthstone ES5 Original White Stoneware Clay, which has a firing temperature of 1200
I've been having problems with pitting in glazes lately and am wondering is it good practice to fire an empty kiln to burn off any potential lingering fumes to help glazes? Have been firing non-stop with about 2 months now, and in the last few weeks a lot of work is coming out of the kiln with pits. Have been in touch with my clay and glaze supplier and they are stumped! Have tried many firing schedules, from slow to fast, with up to 45min soaks at top temp and tried a drop and hold schedule but nothing seems to work. Have also tried bisque firing high to 1020oC with a 45min soak at