--- In
Homebrew_PCBs@yahoogroups.com, "mr_gees100_peas"
<geovar13@h...> wrote:
> I'm new at this and I want to do my first pcb. I have a cad
software,
> copper board, ferric chloride, drills, ect, ect. By doing a lot of
> reading I think I have a god idea on how to do it. However, of all
> the webpages and articles I found on how to make a pcb non of them
> talk about what to do with the left over feric chloride. I don't
> think my sewage piping would like me dumping the stuff down the
> toilet and neither would the enviromentalist. So, my question is,
> what am I suposed to do with the feric chloride once I make my
first
> pcb? Do I have to take it to a collectionn falicility? Is there a
way
> to neutralise it so I can dump it in the drain and is so, is this
> legal or good to do?
Put the etch in a plastic can alteast 4 times the size of the etch
volume. (say 1 liter etch)
Thin it with the same amount water.(makes total 2 liter)
Fill under continu movement 25% caustic-soda 250 gr. p/l (makes total
of 4 liters.
At it slow then it could be react as heating up
For the peaple who can messure pH it must about 8 to 8,2
Let the etch rest for atleast 24h to neutralize the acid and sink of
the copper and ferro.
the fluid must be light yellow and may drop into the drain.
The sink part of the fluid must be disposed proper to local collector
off chems in your town
ill try't my best to translate it from dutch.