Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@...> wrote:
>
> On Mon, 06 Feb 2006 22:07:14 +0100, leon_heller  
> <leon.heller@...> wrote:
> 
> > If you use HCl and H2O2 for etching, and acetone for cleaning, don't
> >
> > add the acetone to the etchant for disposal. It might form TATP, which
> >
> > would be very unstable at room temperature and could explode, although
> >
> > it is unlikely.
> >for a 
> >
> > Leon
> 
> 
> More importantly, don't buy H2O2 together with Acetone and strong acids.
> That might just make them suspicious in some countries.
> 
> ST

Simple fix. I'd suggest mixing your HCL/H2O2 etchant as soon as you
purchase the ingredients.  I suspect the resulting mixture would be
either useless or very dangerous to use for creation of the nasty
thing you mentioned.

Secondly, don't use acetone to remove toner.  Use lacquer thinner
which contains a mix of solvents.  Once again, I suspect that the mix
of solvents would likely disrupt its use for nefarious purposes.

It's a real shame that there is so very much paranoia about terrorism
that even home PCB makers need to worry about what they buy.  To put
it in some rarely heard perspective, the number of Americans killed by
international terrorism since the late 1960s (which is when the State
Department began counting) is about the same as the number of
Americans killed over the same period by lightning, or
accident-causing deer, or severe allergic reaction to peanuts.