Homebrew PCBs

rolanyang wrote:
> Yea, from what I read, you just let the let the pump bubble/aerate
> the solution for a while, and then it changes back to the
> green color.... and it seems to work :)
> 
> If this were to become popular, it would put those Ferric Chloride
> distributors out of business.
> 
> Someone on the list mentioned earlier that they were hospitalized
> for copper poisoning. I am slightly concerned about the toxicity
> of the stuff. From the MSDS, it doesn't sound very toxic, but
> the fact that the guy was sick enough to be put in the hospital
> concerns me..
> 
> ~Rolan 


What he didn't mention was *HOW* he became intoxicated. I mean 
was he drunk one day and his friends dared him to drink some 
cupric chloride solution, or did he get a spec under his 
fingernail and later got poisoned when he bit his fingernail.
Yes, I agree there is reason to be concerned, but no more so than 
any copper compound which includes *ALL* copper etchants use for 
PCB making. For a good understanding on the biochemical aspects 
of copper see;

http://www.inchem.org/documents/jecfa/jecmono/v48aje06.htm

Fatal oral human dose is 200mg/kg bodyweight.

that translates to a 70kg person eating about 2 TABLESPOONS 
(55grams) of copper sulfate.

Dietary copper intake is 0.05mg/kg bodyweight.