Without the right equipment for addition of Hydrogen Peroxide, addition to
Cupric Etchers can be wasteful, and perhaps more exciting than you want it to
be.

Copper is a catalyst for decomposition of Peroxide, so you add it only by
pumping it in SLOWLY, in a system designed for the purpose.

Either can give you highly unpleasant results if added in excess, so, have A
LOT of mixing, and a well set up ORP measurement.

Beyond that, the Hydrogen Peroxide produces only water as a by product,
whereas Sodium Chlorate produces Sodium Chloride (Salt) as byproduct, and
this may affect how you can dispose of spent.  In theory, using Hydrogen
Peroxide produces pure Cupric Chloride solution, which, in theory has
commercial value as is.

Good luck

Rudy Sedlak

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