Homebrew PCBs

On 23/11/12 18:54, smilingcat90254 wrote:
> As a rule of thumb, transition metal salt such as copper chloride are very
> toxic. DO NOT pour it down the drain. Neutralize it first with sodium
> carbonate. Excess HCl reacts with carbonate to form table salt, water and
> CO2. But the toxic copper chloride is still there.
>
> Evaporate out the water to get copper chloride salt then when you have
> enough, take it to haz-mat recycling. California hazardous roundup was pretty
> good. take any "household" toxic material no questions asked. Label it
> clearly so they know what they got :) The people collecting most likely have
> no clue when you hand over copper chloride solution. They'll just thank you
> and take it from your hand. and be sure to add mixture of spent containers
> like herbicide container (round up), used car oil, old paint, paint
> thinners...
>
> And be very safe with the stuff. Just because you can make it at home so
> easily doesn't mean its not that toxic.

It makes extremely good weed killer. It will leave a black spot on the lawn, but 
it recovers after a few weeks.

Drain unblocker/root-killer for toilets is copper sulphate, and is also sold as 
moss killer in gardening shops.

Ferric Chloride is also known as Profloc F here, and is used as a floculating 
agent for sewer treatment.