Dr.Tom Roess on mon 14 feb 00
------------------
Hi everyone,
I have found information says Red Copper Oxide (cuprous oxide) is =
more
concentrated and therefore stronger than Black Copper Oxide (cupric).. Does
anyone know how to substitute one for the other? Chappell suggests 1 part
Black Copper Oxide for 2 parts Copper Carbonate, but I can't seem to find
anything on Red Copper Oxide.
When recipes call for Copper Oxide do they ordinarily mean red or
black? We have both in the lab, so I'm confused.
TIA
Lou in Snowmass
Wade Blocker on tue 15 feb 00
----------
From: Dr.Tom Roess
To: CLAYART@LSV.UKY.EDU
Subject: Copper oxide question
Date: Monday, February 14, 2000 12:35 PM
----------------------------Original message----------------------------
------------------
Hi everyone,
I have found information says Red Copper Oxide (cuprous oxide) is
more
concentrated and therefore stronger than Black Copper Oxide (cupric)..
Does
anyone know how to substitute one for the other? Chappell suggests 1 part
Black Copper Oxide for 2 parts Copper Carbonate, but I can't seem to find
anything on Red Copper Oxide.
When recipes call for Copper Oxide do they ordinarily mean red or
black? We have both in the lab, so I'm confused.
TIA
Lou in Snowmass
----------
Lou, When copper oxide is called for it usually means black copper
oxide. Copper Carbonate is green.
Black cupric oxide CuO (black and red oxides are stable) molecular
weight 241
Red Cuprous oxide Cu2O
" " 144
Carbonate CuCo3 (strictly CuCo3Cu(OH)2 "
" 119 due to its finer particle sizethe carbonate form will
give a more uniform color
Green coppper oxide (cupric) Cu0 "
" 80
According to Robert Fournier" some potters believe that red cuprous
oxide should be used for reduced copper glazes. It will quickly revert to
cupric green in oxidation. The cuprous oxide is in the" reduced "or lower
oxide state and will revert to CuO in a glaze unless the reduction is
maintained. The green carbonate will decompose in hot water and is more
toxic than the oxide."
This is not the exact info you asked for, but it is the best I can
come up with. Mia in warm and sunny ABQ
vince pitelka on tue 15 feb 00
> I have found information says Red Copper Oxide (cuprous oxide) is
more
> concentrated and therefore stronger than Black Copper Oxide (cupric)..
Does
> anyone know how to substitute one for the other? Chappell suggests 1 part
> Black Copper Oxide for 2 parts Copper Carbonate, but I can't seem to find
> anything on Red Copper Oxide.
> When recipes call for Copper Oxide do they ordinarily mean red or
> black? We have both in the lab, so I'm confused.
Lou -
Red copper oxide has absolutely no affinity for water - it does not mix into
water-suspensions. No matter how much you blend it, it just comes right
back to the surface. So the answers to your questions are moot.
Best wishes -
- Vince
Vince Pitelka
Home - vpitelka@dekalb.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Dave Finkelnburg on tue 15 feb 00
Lou,
CuO, black copper oxide, (cupric) molecular weight 80
Cu2O, red copper oxide (cuprous), molecular weight 143
CuCO3, copper carbonate, molecular weight 124
IF what you have is relatively pure, then the amount of copper in 100
grams of the carbonate, is the same as the amount of copper in 65 grams of
black copper oxide, is the same as the amount of copper in 58 grams of red
copper oxide.
I leave it to you to check the analyses of what you have, and, if
necessary, correct the ratios if one of the analyses is significantly
different than the pure compound.
Hope this is helpful!
Dave Finkelnburg
-----Original Message-----
From: Dr.Tom Roess
To: CLAYART@LSV.UKY.EDU
Date: Monday, February 14, 2000 12:36 PM
Subject: Copper oxide question
----------------------------Original message----------------------------
------------------
Hi everyone,
I have found information says Red Copper Oxide (cuprous oxide) is
more
concentrated and therefore stronger than Black Copper Oxide (cupric).. Does
anyone know how to substitute one for the other? Chappell suggests 1 part
Black Copper Oxide for 2 parts Copper Carbonate, but I can't seem to find
anything on Red Copper Oxide.
When recipes call for Copper Oxide do they ordinarily mean red or
black? We have both in the lab, so I'm confused.
TIA
Lou in Snowmass
Gary Elfring on wed 16 feb 00
>Red copper oxide has absolutely no affinity for water - it does not mix into
>water-suspensions. No matter how much you blend it, it just comes right
>back to the surface. So the answers to your questions are moot.
>Best wishes -
Just add a touch of bentonite to your red copper oxide and water. It will
mix quite well.
Elfring Fonts, Inc Bar Codes, MICR, and decorative fonts for Windows
http://www.elfring.com
Paul Taylor on wed 16 feb 00
Dear Lou
I have never heard of red copper oxide.
Many people including myself use copper Carbonate it is meant to be
finer.
Does brass or bronze have an oxide form? And how would one prepare it?
could that be your red oxide?
Paul T
----------
>From: "Dr.Tom Roess"
>To: CLAYART@LSV.UKY.EDU
>Subject: Copper oxide question
>Date: Mon, Feb 14, 2000, 7:35 pm
>
>----------------------------Original message----------------------------
>------------------
>Hi everyone,
> I have found information says Red Copper Oxide (cuprous oxide) is more
>concentrated and therefore stronger than Black Copper Oxide (cupric).. Does
>anyone know how to substitute one for the other? Chappell suggests 1 part
>Black Copper Oxide for 2 parts Copper Carbonate, but I can't seem to find
>anything on Red Copper Oxide.
> When recipes call for Copper Oxide do they ordinarily mean red or
>black? We have both in the lab, so I'm confused.
>TIA
>Lou in Snowmass
Jim Brooks on thu 17 feb 00
Gary, if you will use a little dish washing liquid, the red copper will mix
into your glaze. It doesn't take much.. maybe just a small squirt. And of
course the dish washing liquid burns off early in the firing.....
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