[Clayart] clay body
John Hesselberth via Clayart
clayart at lists.clayartworld.com
Wed Aug 27 11:03:37 EDT 2014
I don’t know much about clay bodies, but I do know that Cushing’s Handbook has several pages of recipes with some comments on how they behave. He gives recipes for raku, earthenware, cone 6-10 stoneware and porcelains. You might find some hints in there on formulating what you want. Last I heard his handbook was still available directly from him or his wife. I don’t have an address, but someone on the list usually does when his handbook is mentioned. It is worth owning.
On Aug 25, 2014, at 9:06 PM, James Miner via Clayart <clayart at lists.clayartworld.com> wrote:
> Hi all. It may not be common knowledge among old timers that most
> traditional glazes (containing 40+% feldspar/feldspathoid) will craze on
> the bulk of moist clay bodies that are available for purchase. While the
> coefficient of thermal expansion can be estimated for glazes, it cannot be
> reliably estimated for the body and must be determined by dilatometry or by
> by trial and error.
> I really like seeing glaze recipes from our teachers, the elder statesmen
> and women of clay, but they are less useful for amateurs without some sort
> of clay body that would fit the glaze. This is especially necessary for
> those who may not fire more than a few times a year and cannot test a whole
> bunch of bodies for throwability or fit. I recently contacted a regular
> glaze contributor, who mentioned a couple of hundred clay body recipes that
> he might be publishing, but that is impossible to sort through if you don't
> fire often.
> Since I suspect most clay recipes are handed down during school from
> elders, perhaps those who have had benefit of academic training might
> suggest some general clay bodies that might be worth the time for newbies
> to formulate instead of buying moist clay. Some sort of description, such
> as "throws well", or "most glazes don't craze" might help us find a good
> body. This list serve prides itself on disseminating knowledge, but some
> very practical questions that I have posted in the past have dropped with
> only the reply of crickets chirping. Who will step up and help us newbies
> with very specific and necessary questions?
> Personally, I would like to find a good throwing C10 body for tableware
> that does not warp and can accept some of the traditional glazes of 50 to
> 80% feldspar (such as real temmoku or shino). Any suggestions? Please
> don't ask "what can you get"…I can get anything that major clay supply
> houses stock. If no one replies, my next step is to mine the archives of
> Alfred or Vince at ACC.
> MAILMAN_MIMEDEFANG WRAP
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