Homebrew PCBs

--- 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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