Lily Krakowski on fri 31 jan 03
I use copper carbonate consistently because the oxides are very strong and a
slip of the scale and it is bottle green time. Red copper oxide is not
called for often. I cannot recall a recipe that calls for it. I
believe--correct me someone, please--that because it is coarser [?] than the
black it is used by some in copper reduction --about which I know next to
nothing.
Several years ago one Kelvin Hulmes in the UK sent in a list of coppers and
figured out that for intensity of color red copper oxide was the cheapest to
use. One needs .9 parts of red copper oxide to replace one whole part of
the black, and would need 1.4 parts of the carbonate. I still use the
carbonate...
And that my dears is all I know....
Wanda Holmes writes:
> Lily, how do these various forms of copper compare to one another and to
> copper carbonate in terms of the color response they characteristically
> produce?
>
> Wanda
>
> -----Original Message-----
> From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Lily
> Krakowski
> Sent: Friday, January 31, 2003 7:01 AM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Re: Cobalt tricks
>
> There IS black copper oxide (CuO) and it is pretty black. That is the
> one
> commonly used. There also is red copper oxide (Cu20) which is a lovely
> wine color.
>
> ______________________________________________________________________________
> 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/
>
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Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Ann Brink on fri 31 jan 03
In connection with red copper oxide, one thing I learned was that when you
add it to water it floats. Add a TINY bit of detergent to solve this
problem. Someone gave me some, and yes, it seemed pretty strong in color.
Also larger grained.
Ann Brink in Lompoc CA
----- Original Message -----
From: "Lily Krakowski"
> I use copper carbonate consistently because the oxides are very strong and
a
> slip of the scale and it is bottle green time. Red copper oxide is not
> called for often. I cannot recall a recipe that calls for it. I
> believe--correct me someone, please--that because it is coarser [?] than
the
> black it is used by some in copper reduction --about which I know next to
> nothing.
>
> Several years ago one Kelvin Hulmes in the UK sent in a list of coppers
and
> figured out that for intensity of color red copper oxide was the cheapest
to
> use. One needs .9 parts of red copper oxide to replace one whole part of
> the black, and would need 1.4 parts of the carbonate. I still use the
> carbonate...
>
> And that my dears is all I know....
>
>
>
> Wanda Holmes writes:
>
> > Lily, how do these various forms of copper compare to one another and to
> > copper carbonate in terms of the color response they characteristically
> > produce?
> >
> > Wanda
> >
> > -----Original Message-----
> > From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Lily
> > Krakowski
> > Sent: Friday, January 31, 2003 7:01 AM
> > To: CLAYART@LSV.CERAMICS.ORG
> > Subject: Re: Cobalt tricks
> >
> > There IS black copper oxide (CuO) and it is pretty black. That is the
> > one
> > commonly used. There also is red copper oxide (Cu20) which is a lovely
> > wine color.
> >
> >
____________________________________________________________________________
__
> > 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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