--- lcdpublishing <
lcdpublishing@...> wrote:
> Hi Guys,
>
> This is the first time i have run across something like this. I was
> doing some experimenting with the ink over the weekend for etching.
> Anyway, I dipped a board in Ferric Chloride for about 10 seconds or
> so to give it a dull surface. I rinsed it off, not super good, but
> rinsed it and left it to dry in my soldering jig.
>
> It turned all black. So, I just took some scotch brite and started
> to polish it and began coughing right away. It appears as though
> the copper oxide (whatever the black stuff is) can be a repiratory
> irritant of some sort.
...
the way to remove the oxide is with muriatic acid (HCl)...
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