Earl Krueger on thu 5 feb 04
John, Ron and Jon, and others who may wish to comment;
Regarding recent discussions regarding absorption, I have to ask:
1. Is absorption the only criteria to be used in classifying a ceramic
as Earthenware, Stoneware, etc.?
2. What other characteristics would be appropriate in differentiating
the various classes?
3. If there are other characteristics that are applicable, how do you
deal with overlaps (i.e. characteristic A makes it a stoneware but B
makes it earthenware)?
4. For what purpose(s) do we classify ceramics as Earthenware,
Stoneware, etc.?
Thanks...
Earl K
Bothell, WA, USA
Who knows not enough to contribute, but enough to ask questions.
Earl Krueger on fri 6 feb 04
Rick,
It do appear as if you got my point.
I've never been to the Paris Hilton. Is it better than the one in New
York?
Thanks...
Earl K...
Bothell, WA, USA
piedpotterhamelin@COMCAST.NET on fri 6 feb 04
Hi Earl
American Stonewares by Georgiana Greer answers your question in one perspective:
"Earthenware bodies in the low temperature range must be heated to 1000 to 1100 degrees C., while those in the upper earthenware range (my comment-what others call mid-range) must be heated to 1100 to 1200 degrees C. to mature. (Orton cone 06 to 01 and cones 1-5)Stoneware bodies are generally supposed to mature and vitrify between 1200 degrees and 1300 degrees C although refractory stoneware bodies may need temperatures as high as cone 14 (1390deg C)to mature. Porcelain bodies fire to a temperature between 1250 to 1400 deg C.
A consideration of advanced industrialized techniques involving the addition of artificial fluxes to clay body mixtures, , makiing them vitrify at lower temperatures is not in the case of the utilitarian ware made in small shops".
I will attemptto find other sources to argue that it is a heat range classification, not the property of the ceramic that denote the classification.
Yet, I have seen historical yellow "stoneware" clays fired with lead glazes in the low earthenware temp range and be called yellowware. Industrial whitewares are fired in the high earthenware range,have low absorbancy, made with the "Noble" clays of kaolin and ball and are only called Earthenwares because of the firing range.
Earl stop asking such questions. Be a good American and go watch the television images of janet jackson or paris hilton. Don't you know that it is un-American to think?
Rick
Rick
--
"Many a wiser men than I hath
gone to pot." 1649
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