--- Adam Seychell <
adam_seychell@...> wrote:
> rolanyang wrote:
-snip-
> > Here's another idea:
> > does anyone know if copper powder is cheap?
> > The reaction would likely go a lot faster
> > since the suface area of powder is drastically
> > greater than when using plain old scrap wire
> > or boards.
> >
>
>
> You can get copper powder from some art supplies, but its VERY
> expensive for what we are doing. I think they use it as pigments
> in paint, or coating surfaces. Its almost fine as flour and thus
> dangerous to breath in.
>
> You can react either, copper carbonate, copper(II) oxide (black
> pigment powder) or copper(II) hydroxide (bright blue powder for
> fungicides) with HCl and instantly get copper(II) chloride
> solution. The problem is none of these are easily/cheaply
> available as scrap copper in the quantities we need (1 kg of
> copper). Maybe they are, but I don't know of any.
> You can get few hundred grams at very high $/kg or buy 25 kg bag
> from an industrial supplier at low $/kg but you'll have ∗way∗ to
> much. Unfortunately there is no in-between.
See, now, you should check the links pages more often. Here are a
couple of links I'd posted there:
Flip Stick- Cupric Chloride
Meant for cleaning flues, this is a way to get Cupric Chloride for
etching from your hardware store.
http://www.herchem.com/Products/FSTICK.html �
King County IMEX
Industrial Materials Exchanges. In King County, ie, Seattle, WA
area. Companies getting rid of surplus or waste chemicals and other
hazardous materials. Cheap or free.
http://www.metrokc.gov/hazwaste/imex/More info on copper oxides:
http://www.reade.com/Products/Oxides/copper_oxide.htmlExcerpt, should give some clue as to where to look for this:
∗ Typical Applications:
Cu2O is used in red ceramic porcelain glazes and red glasses. Also
a pigment for anti-fouling paints. CuO is used as a flux for CA
metallurgy, as an optical glass polishing agent, as a pigment, in
sweeting petroleum gases and in galvanic electrodes.
Copper powder pigment from an art store:
http://www.gamblincolors.com/materials/metals.htmlDaniel Smith has metal powders for pigments:
http://www.danielsmith.com/dry-pigments.htmlNo idea of the actual alloy used or if it is "pure" copper.
This company sells copper powder for cold casting, electroplating,
and metal forming so the alloy would be a known quantity:
http://www.makin-metals.com/powders.html=====
Steve Greenfield // Digital photography, scanning,
Polymorph Digital Photography // retouching, and photomorphing
253/318-2473 voice // to your specs.
polymorph@... //
http://www.polyphoto.com/ // Based in Tacoma, WA, USA
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