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TBC

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  1. TBC

    Help With Shivering

    Thanks so much. I'll give it a try. I'm not sure if I'll be able to actually see the results, because it has only happened to 2 out of hundreds of pieces. But maybe adding 5% -10%, if it's not to runny, is just a good thing to do. Thanks again, you have really helped alot!!!
  2. TBC

    Help With Shivering

    Thanks for the reply! would it be possible to simply add feldspar/flint to a commercial glaze? I would do tests of course. Thanks again.
  3. I need help!!! I teach at an elemtery school and 2 pieces have shivered after comming out of the kiln. I have never had a problem with this untill now and I don't know why. Both pieces were in seperate kilns. I use a high talc body (Steve's white from AArdvarks) Electric kiln (oxidation) ^04 Bisque Mayco underglaze Sometimes I fire the underglaze to 06 to set it, and sometimes I go straight to the overglaze. Mayco clear overglaze ^06 Is it possible that not fireing the underglaze first is the culprit? Do I really need to fire the underglaze to ^06 to set it come to that? I'm worried that in 10 years all their 1st grade projects will have shivered off all their glaze. Can anyone help?
  4. I use (or used) the 'wax on a hot pan' method. Paraffin. I used to use old candles but I found the dyes and scent create alot more fumes. I had a bad case of fumeing at the elementry school where I work and smoked everyone out of the kiln room. I wanted to know why the vent system wasn't taking care of the problem. I researched it and I found that even the best vent, won't take care of wax fumes. I searched Clay Art and a couple other places. I don't know why this is. I'd like to know more about this if someone has information on this. Just somethings to chew on. Also all wax is toxic, bee's wax or otherwise. Good luck.
  5. Bone actually does shrink a bit. I pulled this out of my archives. It's by Angela Von Den Driesch, 1976. A Guide to the Measurement of Animal Bones From Archaeological Sites. They are results from an experiment done to determine the size of bones exposed to heat. The results concluded: Bones heated for 1 hour at 850 C., turned black and had a loss of 5% of their size (50% of their weight). Bones heated to 1000 C., for 1 hr 20min turned white and had an average loss of 15% in size (also 50% their weight). I don't know if this will help, but I have waited many years to share that tid bit. Ha! Good luck.
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