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Safe DIY PCB etchant

Hello out there, I was wondering if anyone knew a safe, homemade PCB etchant other than the vinegar and hydrogen peroxide method. That produces copper (II) acetate and I don't have any use for it other than copper plating, and I suck at electroplating anyways. I would like to find a safe, homemade copper etchant that is easily disposed or can be reused for something.  Thanks, Sam.

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Let me know how it comes out.

No true current is the reverse.

Positive to a sacrificial piece of metal in the salt water and negative to the PCB.

We think of current traveling from + to - when in fact it travels from - to +.

When we first started to work with electricity we didn't know for sure what direction it traveled in so we picked one and developed theories based on what we picked when in truth it was the reverse, we discovered this when we started to make electronics.

Joe

No, electron current is the reverse. You're forgetting ionic conduction.

...and hole conduction.

Ignore if you've already seen this one:

Make 10 Etchants for Copper Printed Circuit Boards

That one is good I found it entertaining.

Joe

I can't think of a practical etch that's 'safe', because salt will kill effectively. There should be no way your sibs get NEAR this

at 13, you probably haven't got the chemistry knowledge to understand it. CuCl2 attacks copper to form 2CuCl

cupric chloride works well and is easy to

There is straight salt and water electro etching.

I don't know how well it would work on a PCB, but it does a nice job on steel.

Joe