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About wirerabbit

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    Rockport TX
  • Interests
    Clay, fire, clay, fire.
  1. Specific Gravity - Cones - Variables?

    For those of you who wish to keep records of your glazes' specific gravity, but do not have a fancy graduated cylinder, Have No Fear. You can use anything that can hold liquid which will fit on your scale. Some things to think about. 1. The container needs to be such that you can fill it to a consistant level. If you choose something that you just fill all the way to the top, the container needs to be easily cleaned on the outside, so the measurement is more accurate. 2. The container should have a place that can be easily used to record the water weight of the proscribed volume 3. I think it a good idea to stick with containers that won't break easily, but that's just clumsy old me. Here is what you do: Fill the measuring container with clean, room temp (don't have to be super accurate in the temp. here) water. I just use the rainwater I collect for glazes. Next you mark the level of the water so that all your fills will be to this line. Weigh the water and record that measurement, on the container if possible, with a waterproof marker. That weight will be your "one". Specific gravity scale is based on water having a value of 1, so heavier suspensions will be greater that 1 and lighter liquids will be less than 1. The formula for s.g. is weight of unknown volume / weight of the same volume of H20. Pretty simple. So with your dixie cup, or pickle jar, or pint scoop, you would divide the weight of your sample, by the weight you recorded in waterproof marker on your container! Remember, if you are mixing your glazes with water, the specific gravity of any of your glazes (as far as I know) will always be a value larger than 1. One more thing. If you keep that measuring container forever, you can simplify things for yourself and just record the actual weight of your glaze rather than calculating the s.g. Slip casters call this the "pint weight". Recording this gross number on your glaze buckets allows you to do less figuring and more potting, but don't forget that initial s.g. reading or you'll be sorry when the cat knocks the "specific gravity mug" off the top shelf in your studio. Has anyone mentioned yet that unless two people bisque to the identical porosity, the specific gravity for one will still only be a ball park number for the second? Hope this helps, and sorry if someone has mentioned this earlier in the thread. Sometimes I don't read carefully. Peace out, Taylor in Rockport TX
  2. Lori, I put a fun piece in our Art Center's Members Gallery that included found objects from around the center (where I work) and a little test bowl I trimmed through but still bisque fired. I used it for the base of the piece which I called Maternity Leave. My co-worker was just back from having her first child. I also used a fun little kiln god figure.
  3. Saggar Firing

    Nice pots, Marci, Hope to do some of this "higher fire saggar work" soon. I have a concrete pad ready for a metal structure. Then I will have a place to put all my raku conversion kilns. May even have one that can go past raku temps. Is 1600 your target temp for this type of work? What effects do you see if you accidentally over or under fire the saggars? Thanks for sharing.