9V battery enclosure etching

Hello everyone,

I just tested this. It's a simple method to etching with 9V battery and salt water (or vinegar)

I use a paint marker (oil based see pic) to do that. Here my test and i do it on my tube screamer.
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Hope it will serve you
Did you only use a single 9V, from the pic that's what it looked like. The youtube demo had 2 in series. I wonder what the difference would be, maybe faster etching?
 
Hi, i have test with 18v power supply too, not huge difference. More fast but no more depth.
Seems that's the intensity can make visible changes.
 
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