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In the Studio (13 posts)
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  1. In Topic: Specific gravity

    Posted 2 May 2013

    View PostOffCenter, on 02 May 2013 - 08:15 AM, said:

    I think I still have a tube hydrometer somewhere, but the one that grew naturally at the end of my arm is more accurate and always handy.

    Jim

    So, glaze runs off nail or glaze runs out of the container in so many seconds or glaze covers your hands like cream. Please explain, and thanks.

  2. In Topic: Specific gravity

    Posted 1 May 2013

    View PostBen, on 01 May 2013 - 12:21 PM, said:

    View PostBRL, on 30 April 2013 - 09:59 PM, said:

    I don't have a hygrometer and need to calculate the specific gravity of a glaze I am mixing. The glaze is premixed and I wasn't told how much water to add. If I measure 100 ml. In a container and mark the container at that level. Next add some water to glaze and stir well. Then sample the glaze in marked container and weigh. If the weight is 140 gms., isn't the specific gravity 1.40? Thanks for your help.


    That's correct so long as you are compensating for the weight of the container. I do it this way. I have even made myself counterweights for my triple beam balance for the containers I use so I don't have to do any

    Thank you. Thought it was too easy where nothing seems easy.

  3. In Topic: vitrification; functional use of cone 6 stoneware

    Posted 17 Nov 2012

    Thank you for your answers and suggestions. One more question. Why do handles of some mugs get very hot in the microwave after heating for 30 seconds?

    Happy Thanksgiving to all!
    BRL

  4. In Topic: vitrification; functional use of cone 6 stoneware

    Posted 17 Nov 2012

    View PostBRL, on 17 November 2012 - 05:07 PM, said:

    View PostBRL, on 17 November 2012 - 05:06 PM, said:

    View PostOffCenter, on 17 November 2012 - 10:37 AM, said:

    View PostBRL, on 16 November 2012 - 11:13 PM, said:

    How do you know if ^6 stoneware is vitrified? Is it safe to use stoneware to ^6 in oven, coffee mugs, or casserole dishes?


    Throw a small cylinder. Do not glaze it. Fire small cylinder. Put small cylinder on a sheet of paper. Fill small cylinder with water. Leave small cylinder over night. Next morning move small cylinder and look very carefully for any sign of dampness on the paper. If there is no dampness then that clay is vitrified at the cone you fired to. If there is even the slightest hint of moisture where the cylinder was on the paper then that clay is not vitrified and you should test further to see if firing it to a higher cone will mature the clay. But, do not make functional pottery out of it and do not think you can stop the leaking with glaze.

    The answer to your second question is yes if the stoneware matures at cone 6.

    Jim

  5. In Topic: vitrification; functional use of cone 6 stoneware

    Posted 17 Nov 2012

    View PostBRL, on 17 November 2012 - 05:07 PM, said:

    View PostBRL, on 17 November 2012 - 05:06 PM, said:

    View PostOffCenter, on 17 November 2012 - 10:37 AM, said:

    View PostBRL, on 16 November 2012 - 11:13 PM, said:

    How do you know if ^6 stoneware is vitrified? Is it safe to use stoneware to ^6 in oven, coffee mugs, or casserole dishes?


    Throw a small cylinder. Do not glaze it. Fire small cylinder. Put small cylinder on a sheet of paper. Fill small cylinder with water. Leave small cylinder over night. Next morning move small cylinder and look very carefully for any sign of dampness on the paper. If there is no dampness then that clay is vitrified at the cone you fired to. If there is even the slightest hint of moisture where the cylinder was on the paper then that clay is not vitrified and you should test further to see if firing it to a higher cone will mature the clay. But, do not make functional pottery out of it and do not think you can stop the leaking with glaze.

    The answer to your second question is yes if the stoneware matures at cone 6.

    Jim

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