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Re: gEDA-user: Disposing of Etch Solution

The whole point of HCl/H2O2 solution is that you *dont* have to
discard it.  Over time, it grows into a CuCl etchant which is air
regenerated and shelf stable.

Otherwise, mix NaOH slowly until the solution turns from clear green
to opaque white.  Let the water evaporate, bring the remaining copper
salt cake to hazardous waste disposal.

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