Linda T Ferzoco on thu 9 mar 06
An outfit called Campbells Ceramic Supply of Richmond,
VA has a clay that is mahogany-colored when fresh and
black when fired to cone 6 in oxidation AND which has
no manganese. I saw it here at NCECA and yes, it's
black.
I don't see it listed on their website, so I have
emailed the supplier for more information.
It might help if others inquired about the clay too.
Here's the website: http://claysupply.com/
More later,
Linda Ferzoco
Peter Cunicelli on thu 9 mar 06
Hi Linda,
I'll be very interested to hear what Campbells has to say about this!
Recently, I worked with Aardvark's Basalt. I fired it to cone 5 too
quickly and it blistered and warped. The second time I fired it slowly to
cone 4 and held it for 15 minutes. I didn't glaze it the second time.
The clay is beautiful. I would like to begin making stands for naked
porcelain pieces. The contrast would be stunning. But, the manganese is
a problem.
Are you familiar with the Basalt? I wonder how the Campbells' compares to
it as far as blackness.
This could be really interesting.
Peter
(www.petercunicelli.com)
Helen Bates on wed 17 may 06
Re: New black clay minus manganese
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On Thu, 9 Mar 2006 11:04:59 -0800, Linda T Ferzoco
wrote:
>An outfit called Campbells Ceramic Supply of Richmond,
>VA has a clay that is mahogany-colored when fresh and
>black when fired to cone 6 in oxidation AND which has
>no manganese. I saw it here at NCECA and yes, it's
>black.
>
>
>I don't see it listed on their website (Snip)
The 2005 Campbells Ceramic Supply Catalog:
http://www.claysupply.com/catalog/pdfs/2005_campbells_catalog.pdf
or html version with no photos and quicker loading:
lists a non-manganese-containing clay called "Black Walnut." (No other
details.)
The catalogue has a section on Safety with a brief mention of Manganese
Dioxide Toxicity:
"Manganese Dioxide: (MnO2) Symptoms of overexposure: Elemental manganese
fumes and dust, in high concentrations may adversly affect the central
nervous system with symptoms including languor, sleepiness, weakness,
emotional distrubances, spastic gait, mash-like (sic) facial expression and
paralysis."
From my reading I have come to understand that there is manganese to some
degree in a number of other clays, including darker-toned earthenwares.
There is probably not as much as in the Black Mountain and similar clays
produced by Aardvark, or so I would think.
Now how did Campbell's manage a non-manganese black clay? Black iron oxide?
(Shows my ignorance.)
Helen
Lois Wilkins on thu 18 may 06
I saw the black clay at NCECA, too, but when one of Campbell's
Pennsylvania dealers called about it (on April 21), he was told it
wasn't ready for sale yet, and that they didn't have a date when they
thought it would be ready.
Lois
Lois Wilkins in eastern PA
claywork@verizon.net
>
> >An outfit called Campbells Ceramic Supply of Richmond,
> >VA has a clay that is mahogany-colored when fresh and
> >black when fired to cone 6 in oxidation AND which has
> >no manganese. I saw it here at NCECA and yes, it's
> >black.
> details.)
lee love on thu 18 may 06
--- In clayart@yahoogroups.com, Helen Bates wrote:
> Now how did Campbell's manage a non-manganese black clay? Black
iron oxide?
> (Shows my ignorance.)
>
I am told the black clay here has cobalt in it. Some glazes go blue
over it. I will try to find out more.
--
Lee In Mashiko, Japan
My Google Notebooks: http://tinyurl.com/e5p3n
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