Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "lcdpublishing" <lcdpublishing@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, December 09, 2005 2:24 PM
Subject: [Homebrew_PCBs] Re: Mechanical Etching


>
>> I live in New Jersey and I run www.kleinbauer.com as a real
>> business Tax Number and all. Technically speaking mechanical
> etching
>> keeps me from having to file with the EPA. Every so often the state
>> sends me a letter asking what chemicals I use. Like I said I got a
>> super fund site near me. You guys can dump your chemicals down the
>> drain, I can't. I have already signed on the dotted line saying I
>> don't have chemicals here.
>
> Yeah, they are much tougher out east with regard to "toxic" waste
> removal and such. However, why not just let the chemicals evaporate
> (it's mostly water) which only leaves the solids which are much
> easier to dispose of.
>
> Although, it seems to me that the instructions for Ferric Chloride
> disposal are to dump it down the drain. If the instructions state
> that, I would have to assume it is safe to do so. Is it?

It's basically iron, copper and chloride ions in solution. I can't see the
small quantities used for home etching causing any problems with water
treatment. What the water companies don't like are chemicals that kill the
bacteria in their sewage treatment plants, like some chlorinated solvents.
That is what I was told many years ago by someone from the water company who
used to test the outflow where I worked, at random intervals, several times
a year. I just flush it down the lavatory when it is exhausted.

Leon

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