Homebrew PCBs

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.

Generally stuff doesn't bother me - I smoked for for 35 years or so 
and work around dust all the time in the woodshop.  Very little has 
ever got me coughing that much that quickly.  So, I just thought I 
should mention this in case someone else runs into something similar.

Chris

On Mon, 17 Apr 2006 16:20:56 +0200, 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.
>
>
> Generally stuff doesn't bother me - I smoked for for 35 years or so
>
> and work around dust all the time in the woodshop.  Very little has
>
> ever got me coughing that much that quickly.  So, I just thought I
>
> should mention this in case someone else runs into something similar.
>
>
> Chris


hmm strange..

usually when your body tells you something it is clever to listen ;-)

ST

--- 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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On Tue, 18 Apr 2006 02:03:30 +0200, Herbert E. Plett <cachureos@...>  
wrote:

> 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)...
>


Or sand under water if you must.

ST

I have a good respirator, if I HAVE to ever do that again, I will do 
it outside - with the respirator, AND standing up-wind from the 
material as it is being sanded.

It sure is funny how certain things can set off the coughing like 
that.



--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@...> wrote:
>
> On Tue, 18 Apr 2006 02:03:30 +0200, Herbert E. Plett 
<cachureos@...>  
> wrote:
> 
> > 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)...
> >
> 
> 
> Or sand under water if you must.
> 
> ST
>