Dana Henson on sun 25 jan 98
Can anyone explain to me the uses of red copper oxide. I found a tiny bit of
it at the school where I attend and tossed it into a sagger with a piece made of
white earthenware. I also put in copper carbonate, salt, sawdust, and cedar
shavings. I ended up with a piece that was primarily a deep maroon with some
sage green areas. Was the red copper oxide responsible for this deep maroon
color? I've never seen it before. At the school we use a variety of oxides
but red copper oxide is not one of them. I don't recall seeing red copper
oxide used as colorants in any glaze recipes in books or in any of the recipes
I have seen in the Clayart Archives. In fact, I really haven't seen
any information about red copper oxide. In clay supplier catalogs I have seen
it listed with black copper oxide. Is it the same thing?
-----Something I've been wondering about a long time.
Dana Henson
G_Henson@venus.twu.edu
Peter Atwood on wed 16 feb 00
Vince,
Actually, red copper oxide easily goes into aqueous solution if you add a
couple of drops of dishwashing soap to break the surface tension.
--------------------------------
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
--Peter Atwood in gray and snowy Western MA
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John Rodgers on thu 17 feb 00
Dishwashing soap has a wetting agent/detergent in it. Works really great. I
use it in mold making all the time for similar purposes.
John Rodgers
Birmingham, Al
Peter Atwood wrote:
> ----------------------------Original message----------------------------
> Vince,
>
> Actually, red copper oxide easily goes into aqueous solution if you add a
> couple of drops of dishwashing soap to break the surface tension.
>
> --------------------------------
>
> 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
>
> --Peter Atwood in gray and snowy Western MA
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
Tom Buck on fri 6 apr 01
Logan O, others:
red copper oxide, copper(I) oxide, Cu2O, will oxidize to Copper(II) Oxide,
CuO (black) if left exposed to air for some time (months). So the makers
of Cu2O treat the Cu2O powder with a hydrophobic coating (polymeric,
probably waxy material). This very thin coating repells water, so clumps
of Cu2O won't undergo wetting and disperse readily in the glaze slurry.
One removes the coating by use of a detergent (one end of the molecule is
hydrophyllic, the other end hydrophobic, or one end seeks water, the other
seeks oily organic substances). The detergent also acts to lower the
surface tension of water so it will "wet" the Cu2O particles and enable
them to be dispersed. since in most recipes, only 1-3%w of Cu2O is used, a
few drops of detergent usually is sifficent. however, in the copper
washes used by raku potters, when 80+%w is used, much more detergent will
be required.
good dispersions. bfn. peace. tom b.
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
Bruce Freund on fri 31 jan 03
Hi Lily,
Do you know where I can purchase some red copper oxide? I called several of
the clay companies and no one has it. Has me a little baffled. thought it
might have another name but that makes no sense.
bruce
Lily Krakowski on sat 1 feb 03
Bailey's --1-800-431-6067 lists it.
Bruce Freund writes:
> Hi Lily,
>
> Do you know where I can purchase some red copper oxide? I called several of
> the clay companies and no one has it. Has me a little baffled. thought it
> might have another name but that makes no sense.
>
> bruce
>
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Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Robert Klander on thu 18 sep 03
=20
=20
Hello folks,=20
A friend is having troubles getting Red Copper Oxide into suspension. =
She's
tried a number of different methods, including dry mixing the batch, =
soaking
it overnight, simmering it on the stove-top, and who knows what else. =20
Does anyone have a suggestion as to how to successfully incorporate this
material into a glaze suspension?
=20
Many thanks,=20
Robert Klander
Ann Brink on thu 18 sep 03
Robert- just a few drops of liquid dish detergent will help a lot. Add it to
the oxide and water mixture.
Ann Brink in Lompoc CA
Robert wrote:
A friend is having troubles getting Red Copper Oxide into suspension. She's
tried a number of different methods, including dry mixing the batch, soaking
it overnight, simmering it on the stove-top, and who knows what else.
Does anyone have a suggestion as to how to successfully incorporate this
material into a glaze suspension?
Nanci Bishof on thu 18 sep 03
Try what works in baking. Chocolate & cinnamon are both difficult to get into
suspension if they are not first stirred into the batch before adding the
liquid.
nanci
Fredrick Paget on sun 4 mar 07
If it is a copper oxide it will give a blue- green flame color. If
you have a gas stove you can make the test by picking up a tiny
amount on a wet iron nail and hold it in the flame with a pair of
pliers.
Fred
--
Twin Dragon Studio
Mill Valley, CA, USA
sacredclay on mon 5 mar 07
I've had some colorants around for a long time in some mason jars. Some
of the labels have fallen off but I do know they are food safe. There's
one I wasn't sure what it was. It's brown. Put some of it into water to
see what happend and immediately felt it was red copper oxide becasue
of the way it repels water. I also remembering posting a question about
it and a good soul suggested that I added a few drops of dish
detergent, which worked like a charm. Painted this into a lttle boat to
test at cone 6 and the result was a dark flat metallic oxide. The
colors where thin looks like it was copper carbonate instead, but I
know those things are mostly blue-green in raw form. So, question is,
do any other oxide reacts like this? Is it truly red copper oxide?
Kathryn in NC where it was about 55 degrees and the sky was beautiful.
Down here, we pretty much bypass spring and jump right into summer.
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