Paul Herman on sat 19 aug 06
=?ISO-8859-1?Q?_boring?=
Hi Brad,
Greetings from the east side.
As far as I know, clay manufacturers do not share the recipe for
their clay bodies. So I don't know if B-mix has talc in it. I've been
told there is a lot of bentonite in it, hence the cracking and
warping. It's close to porcelain, but fires grey. The catalogue calls
it stoneware. It throws beautifully, but is touchy in the drying.
I have never seen a porcelain recipe that contains talc, but people
try everything, so it might be out there. Suffice to say most
porcelains contain no talc. The porcelains I mix for myself have
large percentages of non-plastic ingredients, and don't show any
cracking problem.
Best,
Paul Herman
Great Basin Pottery
Doyle, California US
http://greatbasinpottery.com
On Aug 19, 2006, at 10:46 AM, Brad Carter wrote:
> Lili's discussion of clay bodies and Lynn Goodman's question about
> sagging
> porcelain platters have brought to mind questions I have on B-Mix. I
> understand B-mix is a porcelainious clay. But how similar is it
> to porcelain? Is
> B-Mix a hgigh-talc clay? Mel recently wrote that high-talc clays
> have a strong
> tendency to S-crack. Is porcelain a high-talc clay? If so, does
> it also
> have the tendency to S-crack? Thanks to anyone who can shed some
> light on
> all this?
>
> Brad Carter
>
| |
|
