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Ceramics/GREY MARKS ON FIRED PORCELAIN

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Expert: Sam Kelly - 6/26/2009


Question

BELLS
Hi, I recently fired decals at 820degrees celcius on some porcelain bells.....the decals are fine but there is a grey mark all around the base (unglazed section)of the bells that was sitting directly on kiln floor.  Can you help?

Answer
Hi Brenda, The porcelain has absorbed impurities on the surface of the kiln shelfs. Paint your kiln shelfs with 3 parts Alumina Hydrate and 1 part Kaolin mixed in water.
Try rubbing the bells on a flat piece of 1200 grit sand paper, lightly. the absorbtion may not be deep.

Sam
    Questioner's Rating
    Rating(1-10)Knowledgeability = 10Clarity of Response = 10Politeness = 10
    CommentThanks so much Sam....will try what you suggest, Brenda


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Sam Kelly

Expertise

questions with regard to all types of clay, glaze problems and glaze making and application. gas and electric kiln firing

Experience

I am a full time studio potter, also technical assistant in the ceramics department of our local college.

Education/Credentials
I completed a three year ceramics course with 6 distinctions and 5 credits. 2 years as a proffesional potter in on of Australia's largest potteries. Working full time as a studio potter.

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