Fred Parker on fri 11 apr 08
Hi Bill:
It's made by Aardvark. See
Amazing as it might seem, I always thought it was a cone 6 clay and have
fired accordingly -- always having a big question in the back of my mind
why I seem to get an "overfired" look so often. After checking the link
(above) I see that it it best at cone 4 -- NOT cone 6. Go figure...
It's a strange body. Slip made from it has the same bucket appearance as
automotive paints -- a kind of sheen suggestive of suspended metallic
powders. I was looking for a stron black slip for decoration and was
disappointed by the brown color I got from Cassius fired to cone 6. Now I
know to try the same at cone 4. Probably get a black...
Fred
On Thu, 10 Apr 2008 12:28:33 -0400, William & Susan Schran User
wrote:
>On 4/10/08 10:48 AM, "Fred Parker" wrote:
>
>> For what it's worth I've tried something
>> called "Cassius Basaltic" which is a very black body. Aside from its
pun-
>> soaked name, it fires nicely as long as you don't overfire. Overfired,
>> it's loaded with blisters and blebs. You have to do some experimenting
>> with glazes for it. This is one case where the body has a HUGE effect
on
>> the glaze. Let me know if you want more info.
>
>Fred,
>
>I'd be interested in learning more about this "Cassius Basaltic" clay...
>
>Bill
>
>
>--
>William "Bill" Schran
>wschran@cox.net
>wschran@nvcc.edu
>http://www.creativecreekartisans.com
>
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Ed Bull on mon 14 apr 08
There is manganese dioxide in Cassius.
The MSDS can be found at http://aardvarkclay.com/pdf/clays/black_clays.PDF
Easy to google an MSDS for any clay body, just enter something
like "Cassius Basaltic" + MSDS
Although it lists 5mg/M3 in Section 2...
Section 5 Health Hazard Data does not discuss it at all.
Some of the potters at my studio use it and we just talked about the
granular manganese in Standard 112 "speckled clay" in a workshop I gave
last week.
Thanks to all who have taken time to contribute to this discussion.
It seems the main concern here would be when firing and as dust.
In the past we have had potters advise others to use gloves when throwing.
Noone took her up on it but she said it could get under your fingernails
and absorbed that way.
In reading the responses to this thread it seems unlikely.
Cheers,
Ed Bull
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