Richard Schenz on sun 29 apr 01
I want to use some sheet copper decorations on some of my pottery, but wa=
nt
that nice green patina that I see around.
Can anyone give me some advice on how to make a solution....or where to b=
uy
a small quantity?
Any help or advice would be appreciated and can be sent off line.
Thanks,
Dick Schenz
In Sunny Tucson
John and Dorothy Weber on mon 30 apr 01
Richard
You can get a solution for patina at a stain glass outlet or try a mild
solution of miracle grow and sponge on. I've tried this on copper for an
outside sculpture it has not worked as well as the one from the store.
Dorothy Weber
Manakin-Sabot, Va.
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Richard Schenz
Sent: Sunday, April 29, 2001 2:56 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: How to get green patina on copper
I want to use some sheet copper decorations on some of my pottery, but wa=
nt
that nice green patina that I see around.
Can anyone give me some advice on how to make a solution....or where to b=
uy
a small quantity?
Any help or advice would be appreciated and can be sent off line.
Thanks,
Dick Schenz
In Sunny Tucson
_________________________________________________________________________=
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ian vonthaden on mon 30 apr 01
hello,
i should preface this patina information with its source. Dan Millspaugh,=
a
professor of sculpture at the university of north carolina in asheville
recomends that to achieve a permanent patina on copper items the best
product to use is human urine. that's right, just pee on it. i am assumin=
g
this has something to do with the ammonia in urine, but i am unsure if
straght ammonia would work. there are also patina products available at m=
ost
arts & crafts stores.
thanks'
ian in albania
>From: Richard Schenz
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: How to get green patina on copper
>Date: Sun, 29 Apr 2001 18:56:28 +0000
>
>I want to use some sheet copper decorations on some of my pottery, but w=
ant
>that nice green patina that I see around.
>
>Can anyone give me some advice on how to make a solution....or where to =
buy
>a small quantity?
>
>Any help or advice would be appreciated and can be sent off line.
>
>Thanks,
>Dick Schenz
>In Sunny Tucson
>
>________________________________________________________________________=
______
>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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Snail Scott on mon 30 apr 01
Dick-
Generally speaking, there are two ways to get
green copper oxide on copper.
One is the 'cold' method, in which any adequately
strong oxidizer (an acid, for example) is applied,
and kept damp (wrapped in plastic, for example).
Household vinegar will do the job, if left for
a sufficient period of time.
A 'burial' patina may suit your work, or not.
Add the vinegar to sawdust or cat litter until
moist but not soggy, and put in the plastic bag with
the pot. Let sit until the effects are adequately
developed. (Anywhere form days to weeks, depending
on temperature, saturation, and desired effect.)
This will be a fairly irregular surface, and may
compliment a pit-fired clay surface nicely.
Another method is the 'hot' method. The metal is
lightly heated (with a small propane torch, for
example) and the chemical is applied by stippling
with a stiff natural-bristle brush. The hot methods
are more controllable and quicker, though less
'organic' looking without practice. (Don't overheat!)
A weak cupric nitrate solution will give a similar
effect artificially. This is how the greens are
developed on bronze sculpture. Highly controllable,
but tricky without practice. (I was a professional
bronze patineur for a number of years.)
Note: All these methods will work better on metal
which has been roughened by sandblasting, or at
least sandpapered. The surface of sheet metal has been
closely compressed in a rolling mill during manufacture
and is not very 'open' to chemical effects.
-Snail
At 06:56 PM 4/29/01 +0000, you wrote:
>I want to use some sheet copper decorations on some of my pottery, but w=
ant
>that nice green patina that I see around.
>
>Can anyone give me some advice on how to make a solution....or where to =
buy
>a small quantity?
>
>Any help or advice would be appreciated and can be sent off line.
>
>Thanks,
>Dick Schenz
Snail Scott on mon 30 apr 01
Ammonia tends to create some lovely blue patinas.
I like to bury the metal (I work mainly in bronze)
in the lumps I scoop out of my cat litterbox. (Just
the piss, not the poop.) Scoop it into a plastic
bag, drop in the metal, and set it in the sun on
the back porch. Every few days to a week, I check
the progress, and maybe roll it over. When complete,
a light spray of lacquer or matte acrylic will
protect the finish. (Ammonia from a bottle will do
nicely, but I love having a use for used cat litter!)
-Snail
At 09:56 AM 4/30/01 -0000, you wrote:
>hello,
>
>i should preface this patina information with its source. Dan Millspaugh=
, a
>professor of sculpture at the university of north carolina in asheville
>recomends that to achieve a permanent patina on copper items the best
>product to use is human urine. that's right, just pee on it. i am assumi=
ng
>this has something to do with the ammonia in urine, but i am unsure if
>straght ammonia would work. there are also patina products available at =
most
>arts & crafts stores.
>
>thanks'
>ian in albania
Dwiggins, Sandra (NCI) on mon 30 apr 01
Hooray! A use for cat litter that doesn't involve putting it in the kiln=
!
Thanks for this tip, Snail. I have four cats!
Sandy
-----Original Message-----
From: Snail Scott [mailto:snail@MINDSPRING.COM]
Sent: Monday, April 30, 2001 12:32 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: How to get green patina on copper
Ammonia tends to create some lovely blue patinas.
I like to bury the metal (I work mainly in bronze)
in the lumps I scoop out of my cat litterbox. (Just
the piss, not the poop.) Scoop it into a plastic
bag, drop in the metal, and set it in the sun on
the back porch. Every few days to a week, I check
the progress, and maybe roll it over. When complete,
a light spray of lacquer or matte acrylic will
protect the finish. (Ammonia from a bottle will do
nicely, but I love having a use for used cat litter!)
-Snail
At 09:56 AM 4/30/01 -0000, you wrote:
>hello,
>
>i should preface this patina information with its source. Dan Millspaugh=
, a
>professor of sculpture at the university of north carolina in asheville
>recomends that to achieve a permanent patina on copper items the best
>product to use is human urine. that's right, just pee on it. i am assumi=
ng
>this has something to do with the ammonia in urine, but i am unsure if
>straght ammonia would work. there are also patina products available at
most
>arts & crafts stores.
>
>thanks'
>ian in albania
_________________________________________________________________________=
___
__
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.
Janet Kaiser on mon 30 apr 01
Just put it out in the rain... It will soon acquire a
patina, especially if you are in an area which suffers
=66rom acid rain.
Or spray a weak vinegar and water mix on for "instant"
success.
Good luck!
Janet Kaiser
The Chapel of Art . Capel Celfyddyd
HOME OF THE INTERNATIONAL POTTERS' PATH
Criccieth LL52 0EA, GB-Wales Tel: (01766) 523570
E-mail: postbox@the-coa.org.uk
WEBSITE: http://www.the-coa.org.uk
----- Original Message -----
> I want to use some sheet copper decorations on some
of my pottery, but want that nice green patina that I
see around.
>
> Can anyone give me some advice on how to make a
solution....or where to buy a small quantity?
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