It's Sunday, I'm hungover, I'm bored, I've just read this, and so pictures:

I couldn't find vinegar so I had to waste some delicious sauce, nor do I have any stencils, so I used fake butter to mask off the area I didn't want etching rather crudely.

Battery hooked up, red to the handle, black to the sauce, for 30 seconds or so.

And I have a little bit less pan now.