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> If you keep the Ferric Chloride in a container with a lid and add a bit ofIt will be mostly cupric chloride, after some time.
>> HCl every few months before a use, it will etch PCBs for years if you use
>> air bubbler agitation. Better to keep it.
>>
>
> That works for FeCl3 too? I thought that was just for CuCl2 solution.