Copper Sulphate is poisonous, but not very acidic at all. I'm not
planning to etch the steel, I'm plating it with copper.
I used to use the stuff all the time when I was a little kid to copper
plate things... First for corrosion resistance, later for electrical
conductivity. Then I ran out of the magic blue powder in my chemistry
set... I recently found out I can buy it as root-killer at the
hardware store.
Old time machinists used to use it as a layout fluid on steel. The
copper plating is much more durable than the dyes sold for these
purposes, and takes a sharper scribed line. Since I now have enough
to last me probably the rest of my life, I will almost certainly take
up that practice.
On Wed, Aug 31, 2011 at 11:59 AM, Rick Sparber <rgsparber@aol.com> wrote:
> It would be a great advancement if the copper sulphate works. I tried Draino and later
> tried sulphuric acid. Both broke up the toner before taking much aluminum. I also tried
> a DC current with salt water and it was even worse on the toner. Using the current, I tried
> long exposures at low currents and short exposures at high currents. No joy.
>
> Just to state the obvious - make sure the surface is very clean. Use gloves to both
> protect the surface from skin oils and to protect your skin from the acid. Wear eye
> protection.
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