[sdiy] PCB etching and safety

[jhaible at debitel.net]

> > > > Don't pour the spent Ferric Chl down the drain, 
[...]
> "At this stage the solution is exhausted and requires disposal. This can
> be effected by the slow addition of either calcium carbonate (whiting) or
> sodium carbonate (washing soda crystals) - until effervescence ceases. At
> this point the solution is neutralised and may be disposed of safely."


Neutralised it may be, but it surely will contain a lot of copper,
which cannot be good for the environment.

JH.

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