Louis Katz on fri 30 may 03
Hi Mary
I wish I had good factual stuff for you. Some of it (red copper to
black was gleaned from clayart I believe but it may have been learned
in helena where we worked near American Chemet, an manufacturer of
copper oxides. One of their engineers was a partron of the art and
supported the Bray in many different ways,). How long on this one I
don't know.
The manganese carb that seems to have changed is well over 10 years old.
If I am wrong about these I would love to be corrected, but all I know
is that I have red copper that is no longer very red and manganese
carbonate that looks like the dioxide near the surface of the powder.
Louis Katz
I work on a different Island, 78412
lkatz@falcon.tamucc.edu
http://www.tamucc.edu/~lkatz/LK/slipcastglass/index.htm
On Friday, May 30, 2003, at 09:13 AM, Don Pipes wrote:
> Hope you can help me...under what conditions and how long does it take
> for these two examples to happen(red copper oxide and Manganese Carb).
> Where can I find this information on stability?
>
> Thank you,
> Mary Van Peursem
> Island Pottery
> Corpus Christi, Tx 78418
> dpipes@stx.rr.com
>
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Don Pipes on fri 30 may 03
Hope you can help me...under what conditions and how long does it take =
for these two examples to happen(red copper oxide and Manganese Carb). =
Where can I find this information on stability?
Thank you,
Mary Van Peursem
Island Pottery
Corpus Christi, Tx 78418
dpipes@stx.rr.com
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