Homebrew PCBs

--- "mark.mickelsen" <mark.mickelsen@...>
wrote:

> I'm considering using this combination as an echant
> and I was wondering 
> if anyone could give me some tips as to how to
> dispose of it safely 
> when I'm through with it.  Also, some tips as to how
> to tell when it is 
> all used up a I need to throw it away.  Any help
> would be appreciated.
> Thanks.
> 
>

Save it and use it as a starter for a CuCl2 etch. Add
a few drops of H2O2 for every use and keep it in an
airtight container as long as there's excess acid in
it. It will become a bit greener every time you use
it. Once it's a deep green start maintaining it as
CuCl2.
If at some point it seems too slow and dilute
evaporate it in a shallow tray in the sun for a couple
of days, that's what I did and it worked a treat. If
you don't do many boards just feed it any old scrap
copper. It is a bit of a job getting it started this
way but once you have the hang of it you won't regret
it.

More links:

http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
http://www.pacificsun.ca/~robert/pcb/cucl.htm
http://www.pcbfab.com/iepart4.html

- YD.

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