Homebrew PCBs

On Tue, 09 Aug 2005 16:50:20 +0200, derekhawkins <derekhawkins@...>  
wrote:

>
> The disposal of spent Ferric Chloride has generated several posts in
> newsgroups. From the mixing with washing soda first to the mixing with
> cement before disposal in the garbage. Out of curiousity, how many of
> us here just flush it down the toilet (and clean the bowl afterwards)
> or pour it down the drain with lots of water? I have about two gallons
> of it in the garage along with about 20 gallons of used engine oil and
> transmission fluid. Waiting for the getup and go to cart them all to
> the recycling center.


Many of us don't use FeCl in large quantity, i use CuCl now which can be  
regenerated.

But when i did use FeCl i poured a total of maybe 750ml down the drain  
over a span of a year or more. I don't have sleepless nights because of  
it. However it seems to have stained the lime deposits in the groove  
around the drain long-term.

Use as anti-weed is not stupid at all! I mean you can buy plenty of  
pesticides and fungicides containing copper in some form. If used FeCl is  
suitable that'd be great.

Neutralizing and then letting it dry up to crystals is another option.


ST