Household ingredients pcb etching!!!

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Muriatic acid (HCl) and hydrogen peroxide (H2O2) are quite common household ingredients as well. That works very well and is "rechargeable" - i.e. you can oxidize the fluid by bubbling air through it and reuse it nearly indefinitely. Once you're done, mix the fluid with lime (Ca) that you get from the garden department in a hardware store, dry the mixture and dispose of it in regular household waste.

I highly doubt the author's claim that the fluid is safe to dispose of by pouring it down the drain. Copper is actually fairly nasty stuff for living organisms.

~Tom
 
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