[sdiy] Etching PCBs with non-toxic chemicals

[Matthew Smith]

Quoth Paul Perry at 07/03/11 08:30...
> You can add excess scrap aluminium to give non-toxic aluminium chloride
> and metallic copper. if my memory of chem classes 50 years ago is right..

Although I wouldn't want to pour it on my plants! (Excessive 
concentration of salts.)

-- 
Matthew Smith

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