David Beumee on fri 28 may 04
> Chris Campbell wrote: "Thank goodness clay recycles so well because I have at least another
> ten years to go before I will know anything much about this clay."
I have barrels and barrels of dried (P-60-S from Mile Hi in Denver) porcelain trimmings that I dare not recycle bacause of a bloating problem in the fired body that appears only in the recycled clay, not the original commercially mixed body.
On suggestions from Dr. Carty, engineering prof at Alfred, the water used to mix the recycled clay may be contributing to the bloating, due to water attack on feldspar, i.e. surface dissolution and substitution in the flux particles. I'm doing tests, shortening the slake time to a minimum, and now I'm starting to soak the slurry for increasing amounts of time to see at what soak time the bloats start to appear.
David Beumee
Earth Alchemy Pottery
Lafayette, CO
> Once again, mel has it right ..
>
> '....as with all claybodies, match the clay to the potter, not
> the potter to the clay. your clay should be an extension
> of your personality. it takes years to master a clay. but,
> this is a very hard concept to get into the minds of young
> potters.(no matter what their age is.)'
>
>
> I watch Ron Myers work and wish I could just make one mark
> and leave it alone.
> I hear about Mel working at his quick rhythm through the day
> and it sounds marvelous.
> I see Lana Wilson throw and flip and stamp and wish I could
> just leave whatever marks the process brings.
>
> I want to work with this loose natural confidence,,, but I am
> trapped in a brain that dots the i's and crosses the t's.
>
> So I am attracted to a clay that demands this type of concentration.
> I like to follow its strict rules while fashioning it into contemporary shapes.
>
> Thank goodness clay recycles so well because I have at least another
> ten years to go before I will know anything much about this clay.
>
> Chris Campbell - in North Carolina - p.s. to Mel .... I wrap the pots and
> forget about them for a week ... never touch them except to make sure
> nobody is drying too quickly.
>
>
>
>
> Chris Campbell Pottery, llc
> 9417 Koupela Drive
> Raleigh, NC 27615
> 1-800-652-1008
> FAX : 919-676-2062
> E Mail : chris@ccpottery.com
> Website : www.ccpottery.com
> Wholesale : www.wholesalecrafts.com
>
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John Britt on fri 28 may 04
David,
If I recall, he also says that the best way to avoid this is to blunge at
high speed for awhile. My understanding of this is that if 2 or 3 feldspar
particles are too close they for more glass and give off gas which result
in bloats. (This is the simplified explaination.)
I usually only recycle small quantities of porcelain and use a hand mixer
to smooth out the slip. You might try that.
Hope it helps,
John Britt
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