Edward Gisske wrote:

> It is also highly immoral, if not illegal, to dump it
>into a city sewer system. Putting it out in the trash is also rude....
>
>Dealing with the toxic waste is one of the more difficult problems with
>hobby-etching.
>
>
>
>
Contact your local haz-mat authority (or sewage treatment).  Whenever I
did they simply said dump it down the drain after learning that I was
dispensing of less than a 55 gallon drum.  Obviously this will vary from
place to place as your treatment center may use a different method than
mine, and perhaps this will interfere.  Spent Ferric-chloride will cause
no significant damage to piping in small quantities, though I still let
the water run awhile after I dump it.

If you cannot dump it down the drain, they will often tell you to mix it
with kitty litter or similar clay based absobent and send it to the
dump.  In larger quantities they'll suggest several companies that deal
with toxic waste.

I would not consider it immoral or illegal to dump small quantities of
chemicals down the drain once I was told by local authorities that it's
acceptable to do so.

Please note that here I'm talking about ferric-chloride.  I've no
experience with other etchants.

-Adam

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