search  current discussion  categories  materials - misc 

chemical decomposition-katz

updated sun 1 jun 03

 

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
>
> _______________________________________________________________________
> _______
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>

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