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jacqui sos

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Everything posted by jacqui sos

  1. Thanks so much for all your replies. It was so nice to wake up on Christmas morning and read them!! However, I'm hoping you can enlighten me further.... I understand the whole earthenware/stoneware thing - and was actually thinking of making the butter bell out of earthenware because I guessed the shape was not conducive to higher firing in stoneware - I didnt even think about the vitrification "problem". I'll definitely give it a try next time Ive got some terracotta. In the meantime - can someone explain the "sacrificial slab" to me? Is it just a "saucer" type thing you put underneath the piece in the kiln? I guess it should be made out of the same clay as the piece? Should it be bisque fired or is it green? Can you use it again after the glaze firing or has it done its job of shrinking and wont shrink any more? Do you only use it for the lid part - and why does that warp more than the pot part? If it is only for the lid, you would still have the problem (minor I concede) of having the rim unglazed assuming you put it on the slab resting on the rim. Phew...! Merry Christmas from Down Under!
  2. A little bit off the topic - but if someone could help I would certainly appreciate it...Ive been making French Butter Dishes (I think theyre known as "Butter Bells" in the U.S.) and having a lot of trouble with the Cone 6 glaze firing. If I fire the lid and the pot separately, they both warp. If I fire them together, they usually stick despite using wax with alumina in it. Ive also tried making sacrificial "saucers" to sit both the bell and the insert on - but had trouble with the clay fusing to the pot - although I do concede it could have been that particular clay (which Ive subsequently heard doesnt fire to the temp on the pack!). Anyway - if someone out there in Clayland has a solution, I'd be grateful! Here's a pic of one that worked!!
  3. Thanks for all the comments on single firing - but no-one has mentioned either the firing schedule they use OR whether they use their normal glazes (I fire to Cone 6) I am assuming you may need a much lower temperature glaze to achieve a "glazed" effect. I was thinking of single firing some stoneware pieces for the garden and brushing on earthenware glaze. Can anyone see any potential problems? Also (so many questions!) will single fire, say up to 1000 degrees centigrade, still allow the stoneware clay to vitrify? And must it be fully vitrified for use as a planter pot?? All comments and suggestions gratefully received!
  4. Hi! I have a very small (tiny) electric kiln which I fire up to cone 04. Currently, I have been bisque firing terracotta and earthenware up to 1100C -1150C then glaze firing to 1060C - as the low fire glazes I have say to only go up to this temp. Results have been pretty good so far. I am aware of the dangers of single-firing (with glaze bubbling, pin holes etc) but now I am wondering if it might be possible to fire both bisque AND glaze together in the one firing - say up to 1060-1080C? What would be the down-side of doing this provided I brought the temperature up to 600C very slowly? I really love your forums - and am very grateful to all the wonderfully generous potters, who so freely share their experience and advice!
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