Lolli Cook on thu 1 sep 05
hi
Just wonder if any one has used actual copper grinding remnants from machine
working, in raku glazes, or any other glazes.
I am mostly interested in raku effects, There is some grinding lubricant,
which is envronmentally friendly/biodegradeble (and sulphur based I believe)
in with the grains.
If any one knows a better way to treat this ( i am simply adding it to glaze
surfaces) let me know!
Thanks
LolliCook
Steve Slatin on thu 1 sep 05
Lolli --
Haven't done it with raku and copper; did it with
oxidation firing and silver grinding remnants.
I found that the particle size was too large -- I got
some oxide effects from the metal, but more tiny
lumps. The color of the lump will depend, naturally
on the atmosphere and the metal. You might get some
green where there's oxidation, or a bit of red where
there's full reduction (to Cu2O), but I'd bet at raku
temps you'd probably get some to quite a bit of black
copper oxide (CuO).
That's totally speculative, though, I haven't tested
to try it. I'm just a little concerned, though, with
the possibility that the copper is suspended in a
sulphur compound. Sulpher burns to form hydrogen
sulphide from most compounds, which is quite the
irritant. If your cutting oil (or whatever the
particles are suspended in) is in fact sulphur-based
or sulphur bearing, it might pay to be extra cautious.
(I doubt there'd be enough in the application to be
seriously dangerous, but better safe yadda yadda.)
Best wishes -- Steve S.
--- Lolli Cook wrote:
> hi
>
> Just wonder if any one has used actual copper
> grinding remnants from machine
> working, in raku glazes, or any other glazes.
>
> I am mostly interested in raku effects, There is
> some grinding lubricant,
> which is envronmentally friendly/biodegradeble (and
> sulphur based I believe)
Steve Slatin --
Drove downtown in the rain
9:30 on a Tuesday night
Just to check out the
Late night record shop
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Steve Irvine on thu 1 sep 05
Lolli,
I've gotten some good results by simply sprinkling bits of copper metal, or copper alloy directly on
the wet glaze right after dipping the pot in the glaze bucket. For copper metal I use very fine
copper wire (like the kind used in lamp cords) and cut it into lengths about 5 or 6 mm long. For
alloy I use the leftover grindings from the key cutter at my local hardware store, which is mostly
brass.
Here is an example of a tea bowl that had fine copper wire sprinkled on, and then fired to cone
10R:
http://www.steveirvine.com/clayart/cha12b.jpg
All sorts of interesting effects can be found by trying out materials that aren't usually sold at the
pottery supply stores.
Steve
http://www.steveirvine.com
On Thu, 1 Sep 2005 08:27:36 -0700, Lolli Cook wrote:
>Just wonder if any one has used actual copper grinding remnants from machine
>working, in raku glazes, or any other glazes.
>
>I am mostly interested in raku effects, There is some grinding lubricant,
>which is envronmentally friendly/biodegradeble (and sulphur based I believe)
>in with the grains.
>
>If any one knows a better way to treat this ( i am simply adding it to glaze
>surfaces) let me know!
>
>Thanks
>LolliCook
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