Sam Hoffman on mon 15 nov 04
Hank-
The setoguro bowl on your website is absolutely stunning. Black =
seto =20
was one of my favorite glazes that I saw during my trip to Japan this =20=
summer, but I was not aware of anyone in the area experimenting with =20
it. And to think-your source of andesite is just 15 minutes from my =20
house! I've only been back in Oregon for a year, so I have not had =20
much time to prospect for local materials. Do you use this glaze =20
often?
I do have a nice Santiam slip glaze in the works; its made from =
the =20
same clay used in the salt-fired ware made in Independence in the =20
1890's. I've also found some granite that fires a little bit like =20
feldspathic rock chunks.
Are there any other Oregon potters out there using native =
materials in =20
their clays, slips or glazes? I know that Chris Gum was a master of =20
this; his glazes are phenomenal! (we miss you Chris) Its always =20
interesting to hear about different uses of what's available right from =20=
the ground. That's how it should be right? Out of the earth, into the =20=
fire...
Always looking for new mud,
Sam Hoffman
S.L. Hoffman Pottery
Corvallis, Oregon
www.samhoffman.com
On Nov 15, 2004, at 6:42 AM, Hank Murrow wrote:
> On Nov 15, 2004, at 1:33 AM, Kok wrote:
>>
>> In the book of Arakawa Toyozo "The Traditions and Techniques of Mino
>> Pottery" he wrote about the setoguro:
>> <>> mixture of
>> ash and the iron and manganese compound oni-ita. However, it is =20
>> actually
>> the result of a special method of firing: a teabowl is plucked with =20=
>> iron
>> tongs from the kiln at a temperature of about 1100=B0C-the sudden =20
>> cooling
>> causes the iron glaze to turn black. The marks of the tongs remain =20=
>> but in
>> no way detract from the beauty of the piece.>>
>
>> As it could know the exact recipes of setoguro glaze to remove it =20
>> 1100=BAC
>> from the kiln?
>
> Dear Kok;
>
> My version of Setoguro uses a highly weathered Andesite (volcanic =20
> rock, rich in iron and Mn) that I dig from a roadcut on the Middle =20
> fork of the Santiam River near Albany OR. I add 6% Madrone ash to this =
=20
> to make a glaze that if fired at Cone 10 and left to cool, is a crusty =
=20
> matt brown. When pulled from the kiln at maturity through the stoke =20=
> holes, it is a beautiful satiny jet black, and the tong marks hold. =20=
> The iron doesn't have time to crystalize on the surface, remaining =20
> dissolved in the glaze and making it black. You may see a pic at
>
> http://www.murrow.biz/hank/hankweb-all/page98.jpg
>
> Cheers, Hank in Eugene
> www.murrow.biz/hank
>
> =
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Hank Murrow on mon 15 nov 04
On Nov 15, 2004, at 10:42 AM, Sam Hoffman wrote:
>
> The setoguro bowl on your website is absolutely stunning.
> Black seto was one of my favorite glazes that I saw during my trip to
> Japan this summer, but I was not aware of anyone in the area
> experimenting with it. And to think-your source of andesite is just
> 15 minutes from my house! I've only been back in Oregon for a year,
> so I have not had much time to prospect for local materials. Do you
> use this glaze often?
No, it requires a place near the stokehole to pull it out of the kiln
at temperature. Once I got a few successful ones out of the anagama,
everyone wanted a place by the stokehole, and my spots there
disappeared. My solution will be to build a special small (5 cu ft or
so) test kiln which will have multiple 'doors' so I can pul several
from each firing.
> I do have a nice Santiam slip glaze in the works; its made from
> the same clay used in the salt-fired ware made in Independence in the
> 1890's. I've also found some granite that fires a little bit like
> feldspathic rock chunks.
Bravo!
> Are there any other Oregon potters out there using native
> materials in their clays, slips or glazes? I know that Chris Gum was
> a master of this; his glazes are phenomenal! (we miss you Chris)
Jim Robinson in Phoenix OR is the 'Master of the Earth' in my view. He
is onto any rumoured material in a flash, and makes gorgeous glazes
from them. David Stannard now in Fairbanks was one of my mentors, and
he has written a booklet called "Energy, Environment, and Education",
which describes hi history in clay over 65 years...... prospecting,
refining, and making pottery from native materials. At this time, the
booklet is available on a CD with a viewing file and a printing file. I
could send you one if you like.
I am making native porcelains from rocks which David prospected. Also,
David found the Middle Fork andesite, around the 11 mile mark from the
dam up the bank of Green Peter. I have it on maps and in pics here at
my studio. maybe you could visit sometime.
> Its always interesting to hear about different uses of what's
> available right from the ground. That's how it should be right? Out
> of the earth, into the fire...
As soon as the oil runs out (in 25 years........ gone), that is all
we'll be able to do.
Best to get busy!
Cheers, Hank
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