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Leaves are burning right now. It is definitely one of beautiful season in Rochester.

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Flesh out of the kiln. I test the mugs with boiling water once a while to see any problem with the thermal shock.
They passed.

Thermal shock. If you pour water in ice cube, it cracks.  It is similar to that.  Sudden change of temperature makes the clay and the glaze to expand, if their rates are not the same, it cracks.
If you throw the pot unevenly, it may causes the thermal shock. If the clay and glaze do not fit, the properties of the clay, list goes on. It is good idea to put a spoon (metal) in a cup when pour the hot boiling water, and start with the cold oven. I usually put a dish in 355F oven as long it is room temperature (not from fridge), though.  I read somewhere that 400F is too hot.   I stop making the pie dish long time ago, as everyone bakes differently, and sometimes it broke beyond my control, but I replaced them anyway.
P1070273I am testing a white glaze recently.  I used to use the Vivika’s white glaze until I start using the white stoneware and it started to crazing. I am not sure how I am going to apply it.  This glaze does not show any crazing on the current clay.

Testing mugs

3 thoughts on “Testing mugs

  • October 22, 2010 at 7:02 am
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    I love that blue glaze it looks lovely! Fabulous.

    I used to get cracks in my pots sometimes if I opened the kiln door too early and a draft of cold air came in. Got to be really careful with these things.

  • November 16, 2010 at 2:59 pm
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    Wow this is a great resource.. I’m enjoying it.. good article

  • September 21, 2011 at 12:49 am
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