Homebrew PCBs

derekhawkins wrote:
>>Yes, but it will only etch so much copper than then no more
> 
> 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.

I found that FeCl saturated with copper is *highly* toxic to grass, and
probably most other plantlife, tho the grass does recover after a few
weeks;)

I'd save it for use in a weed sprayer bottle;)

They also sell "root rot" tablets made of copper penta-hydrate for unblocking
toilet sewer pipes, so flushing some used etcher occaisonally will keep
your dunny flushing;) Copper and iron is all natural;)