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About Phlotsam

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  1. Here's a few pics of the kiln and the 2inch square opening at the top, this is the only opening on the kiln, the spyhole at the front being just a glass peephole. Done a lot of reading round this today and thinking I could vent that top chimney out of the small window behind the kiln without too much trouble. Question is should it just be left open or do I need to leave access to it to replace the brick at any point during firing. Have read people who close after 600°c and those who don't. The kiln is actually in the studio next door to mine. It's a fairly large room but one in which 2 o
  2. Thanks Neil, I've got another firing lined up free of oxides and slips fairly soon so we'll see how that goes. The stained slip was about 10% but one of the mugs didn't have the slip inside and still tasted bad so this led me to think fuming oxides as the culprit. The 3 constants in all firings are, clay, kiln and copper. A friend of mine uses the same clay with no weird taste so for now I'm ruling that out. On the subject of kiln firing. The kiln is electric and has been recently serviced and a new bentrup controller fitted. However I know little about using it other than what I've
  3. Thanks for all of your replies people. In answer to some of those questions... The clay is a white stoneware 1120-1280°c First glaze is a leadfree s/w transparent 1220-1280°c (no breakdown of ingredients listed) The second glaze I tried was a Botz 9876 glossy white brush on. In addition on 3 of the mugs/cups I added a coloured slip inside (I used a slip made from the body and a blue green stain. The pic shows 4 of the mugs affected, the 2 on the left have copper oxide and cobalt carbonate slip decoration on the outside, a slip on the inside and Botz white inside the mu
  4. Apologies, realised I've prob stuck this in the wrong section!
  5. Hi, quick introduction, I've just thrown myself into the ceramics world (fairly late) and trying to make as many mistakes as possible, as quick as possible. I suspect this may prove to be one of them, I just can't get to the bottom of it and would appreciate a few pointers. In short I'm throwing with a stoneware clay and made myself quite a few perfectly serviceable mugs, or so I thought. The problem is I'm getting a bitter metallic aftertaste everytime I try them. I bisqued and then fired to 1245°c cone 7? (Turned out it was more like 8 according to my cones) in a shared electric ki
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