William Jacob on mon 24 mar 03
It seems to me, that if you're using the copper for reduction fired copper reds, you'd want to use the already "reduced" cuprous (red) form of copper. Of course, as soon as you start firing in an oxidized atmosphere, the copper will revert to the coupric (black) form, and it really won't make any difference which one you started with. If it was me, I'd test them both. But I like that sort of thing.
good luck,
joe
--- Lily Krakowski wrote:
>Oops. PS. Use the black. It is used more, and if that is an indication,
>the red is not carried at all by many dealers....
>
>
>
>Jocelyn McAuley writes:
>
>> Bringing my focus back to the apolitical -ignoring this black vs red
>> reference of course! :)
>>
>> I am having a deficult time pining my references down on: what is the
>> difference between red and black copper oxide? I have both and don't know
>> which to use for my oxidation glaze tests, when asked to use "copper
>> oxide".
>>
>> I have been arbitrarily using black cu oxide in my recipes I am currently
>> testing. I'd like to be more educated in my choices rather than choosing
>> by chance!
>>
>> thanks
>> Jocelyn- in Eugene where spring has sprung, even if it is gray outside.
>>
>> --
>> Jocelyn McAuley ><<'> jocie@worlddomination.net
>> Eugene, Oregon http://www.ceramicism.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.
>
>
>
>Lili Krakowski
>P.O. Box #1
>Constableville, N.Y.
>(315) 942-5916/ 397-2389
>
>Be of good courage....
>
>______________________________________________________________________________
>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.
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Jocelyn McAuley on mon 24 mar 03
Bringing my focus back to the apolitical -ignoring this black vs red
reference of course! :)
I am having a deficult time pining my references down on: what is the
difference between red and black copper oxide? I have both and don't know
which to use for my oxidation glaze tests, when asked to use "copper
oxide".
I have been arbitrarily using black cu oxide in my recipes I am currently
testing. I'd like to be more educated in my choices rather than choosing
by chance!
thanks
Jocelyn- in Eugene where spring has sprung, even if it is gray outside.
--
Jocelyn McAuley ><<'> jocie@worlddomination.net
Eugene, Oregon http://www.ceramicism.com
Lily Krakowski on mon 24 mar 03
Black copper oxide is cupric oxide is CuO. Red copper oxide is cuprous
oxide and is Cu2O. Having said that: I really know too little but seem to
recall having read that the Cuprous is better for reduction glazes...No
idea.
Jocelyn McAuley writes:
> Bringing my focus back to the apolitical -ignoring this black vs red
> reference of course! :)
>
> I am having a deficult time pining my references down on: what is the
> difference between red and black copper oxide? I have both and don't know
> which to use for my oxidation glaze tests, when asked to use "copper
> oxide".
>
> I have been arbitrarily using black cu oxide in my recipes I am currently
> testing. I'd like to be more educated in my choices rather than choosing
> by chance!
>
> thanks
> Jocelyn- in Eugene where spring has sprung, even if it is gray outside.
>
> --
> Jocelyn McAuley ><<'> jocie@worlddomination.net
> Eugene, Oregon http://www.ceramicism.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.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Lily Krakowski on mon 24 mar 03
Oops. PS. Use the black. It is used more, and if that is an indication,
the red is not carried at all by many dealers....
Jocelyn McAuley writes:
> Bringing my focus back to the apolitical -ignoring this black vs red
> reference of course! :)
>
> I am having a deficult time pining my references down on: what is the
> difference between red and black copper oxide? I have both and don't know
> which to use for my oxidation glaze tests, when asked to use "copper
> oxide".
>
> I have been arbitrarily using black cu oxide in my recipes I am currently
> testing. I'd like to be more educated in my choices rather than choosing
> by chance!
>
> thanks
> Jocelyn- in Eugene where spring has sprung, even if it is gray outside.
>
> --
> Jocelyn McAuley ><<'> jocie@worlddomination.net
> Eugene, Oregon http://www.ceramicism.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.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Earl Brunner on mon 24 mar 03
In less things have changed, red copper oxide used to have some kind of
coating on it that resisted water, making it hard to disperse into a
glaze. This might be overcome with some kind of wetting agent, but
needs to be factored or addressed.
Earl Brunner
Lily Krakowski wrote:
> Black copper oxide is cupric oxide is CuO. Red copper oxide is cuprous
> oxide and is Cu2O. Having said that: I really know too little but seem to
> recall having read that the Cuprous is better for reduction glazes...No
> idea.
>
>
> Jocelyn McAuley writes:
>
>> Bringing my focus back to the apolitical -ignoring this black vs red
>> reference of course! :)
>>
>> I am having a deficult time pining my references down on: what is the
>> difference between red and black copper oxide? I have both and don't
>> know
>> which to use for my oxidation glaze tests, when asked to use "copper
>> oxide".
>>
Jocelyn McAuley on tue 25 mar 03
thanks for all your replys. I am now vaguely remembering
tales of picky red cu oxide floating on top of the water.
Jocelyn
--
Jocelyn McAuley ><<'> jocie@worlddomination.net
Eugene, Oregon http://www.ceramicism.com
iandol on wed 26 mar 03
Dear William Jacob,
It might seem a frivolous suggestion but to get good dispersion and =
eventual solution of copper into a glaze it may be preferable to use =
Copper Carbonate.
Janet De Boos et al(Handbook for Australian Potters) mention that Copper =
oxides eventually become reduced to the metal which can do two things. =
It can go into solution or it can become a colloidal dispersion. She =
claims this is the source of brilliant Ruby Reds.=20
Best regards,
Ivor Lewis
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