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AndreaB

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About AndreaB

  • Rank
    Advanced Member
  • Birthday 09/27/1962

Profile Information

  • Gender
    Female
  • Location
    Johannesburg, South Africa
  • Interests
    Ceramics obsession

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4,589 profile views
  1. Hi everyone, This is my first post of 2019, so I wish for all of you a wonderful year, filled with creativity. My question is (and forgive me for posting it if it has already been posted), I have seen pots that have not been glazed, no burnishing or terra sig and I'd like to know if firing a pot with underglaze only to glaze temperature. My glaze firing is to 1200C. Attached is an example made by a local South African ceramicist Dale Lambert. I believe that her work is fired multiple times. Thanks as always for your comments Andrea
  2. Hi every one, Happy Christmas to all and family. I've just purchased a SpeedBall Bos Elite wheel. The literature that came with it is vague about the voltage this equipment uses. Does it use 110 (American) or 220v (the rest of the world) hahahehe. Can anyone who has the Speedball wheel clarify, or tell me what v you use. Thanks Have a great day
  3. Hi Andrea

    I'm test firing a kiln and I need your opinion.   Cone 6 in the ASD, cones 5,6 and 7 witness cones. One set on bottom shelf by peephole and one set top shelf by peephole.  Kiln set for high fire.  The safety timer knob set for 20 hours.  The kiln is empty because I'm test firing and I'm very new at this!!!

    So the kiln finished firing and cooled.  I open to collect the witness cones.  Top shelf cones are what they should look like for cones 5,6 and 7....I'm happy with that.  I remove the next 2 shelves for the next set and the witness cones are white and standing straight up???? Why would this happen??

    Nanc

    1. Denice

      Denice

      Is this a new or used kiln and what was your firing schedule?    Denice

    2. AndreaB

      AndreaB

      Hi Nancy,

      Sorry it's taken a while to see your post. I'm afraid I'm really the wrong person to be answering this question. You should put it to the forum. My kiln has a temperature difference between the lowest and the highest shelves and this factor is always the case.  This also happens with the way you load your kiln. Top heavy or bottom, biggest pieces in the middle or at the bottom, etc. Have you fired anything since? It may also help you to take a photo of the load prior to firing so you can see how your loading is affected with regard to the cones. Curious as to why you set your safety timer to 20hrs,  Hope you have fun with your new kiln. Andrea

  4. I bisque fire to 1000 deg C and glaze fire to 1222
  5. Is there any advantage to leaving a vessel unglazed? I did try this and found that the surface scratched very easily. How could I avoid this happening? I did glaze the inside, my thinking being that if the vessel were to be used for food purposes then it would be food safe. I do like the look of a matt unglazed surface. A pic of a local potter's bowl is attached. Thanks
  6. Morning everyone, Just realized that I seem to always post on a Sunday morning lol. My question is: how can I apply luster with a smooth continuous line. Mine always has a blob at the start, peters out and then another blob when I reload the brush. Many thanks Have a great Sunday.
  7. Good morning to you all, I'm having a great deal of difficulty with getting my glazing right. A year ago everything was fine, I had a back op last October and have had problems ever since then. Took a break from throwing but came back in Feb, since then I've had one hand done for CTS and the other is on it's way to being done. Since the op my sciatic nerve has been damaged so I have problems with throwing, and indeed pain is probably one factor that is affecting my glazing. I was making forms that were hand built tall vases, glazing became a problem due to the length of time it takes to fill the vessel, put down the jug and then empty the vessel (splashing glaze every where). This done my insides are always too thick leading to major crawling. Was glazing the outside by dipping half and half (top and bottom), leading to thickness around the overlap, Did rub down, but still came up with spots of milky glaze. Now the next step. I used Amaco PC brush on glaze for two new projects, the one has milky streaks and crawling. It was fired stoneware, bisqued to 1000deg C, Glazed to 1200. The glazes used indicate cone 5-6. They were set on the floor of a small kiln (no elements under it). It is possible that at that position the heatwork was not enough (cone did not bend). What should I do now? Refire and raise the vessel to higher point, and what about the crawling, should I try to glaze those spots or should I make a decorative feature by using luster? Give up and rethrow? Thanks for listening On the other hand, what would underglazed but not glazed work do for me?
  8. AndreaB

    Slab vase

    Yes, but not much otherwise it drips and runs
  9. AndreaB

    Slab vase

    Slab stoneware vase with attachments and carvings. Sprayed underglaze
  10. So excited My first regional entry and one of my submissions has been chosen.

     

  11. Yes Babs, I'm a real idiot. I don't know how my train of thought got so wrong. I've seen vids where reglazing is done, but I don't think they were originally fired to cone 8. I was going to use the Amaco glazes and fire to cone 5. Since there is major crawling inside and one of the lids has cracked I think it is not even worth trying. I may just use one of them as a test at some stage just for curiosity.
  12. I use a chamios leather to stick bats to the wheel. My wheel does not have bat pins and throwing a pad is too much effort. The chamios works exceptionally well allowing easy removal and you never have to do the clay pad again
  13. I really need some help with the mixing of high fire glazes and medium. I have these 2 urns and my plan was to have a shiny white interior (stoneware 1200° C) interior with Amaco brush on on the outside, I've done the inside firing to 1200 with a 20min hold. My problem is that the interior has crawled badly so I thought I'd put crushed glass into it and refire, but having already fired to 1200 will the Amaco glazes actually work? TIA Andrea
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