Before
imagem1
imagem2
All you need is something acidic enough like vinegar and an electrolyte like salt. A ratio of 1/4 cup vinegar to 1/4 tsp salt worked for me.
imagem3
9V
Hook up the POSITIVE lead directly to your kettle, Attach the NEGATIVE lead directly to a Q-tip, making sure the wires will be touching the vinegar solution.
MAKE SURE YOU HOOK THEM UP IN THE RIGHT ORDER. The other way around would try to ADD metal to the kettle.
imagem4
Etching tool
imagem5
Stencil
This was the only part I didn't have lying around. They were cheap at a local craft store. Adhesive and re-usable, perfect for this project.
imagem6
Dip the Q-tip in your salted vinegar solution and touch the kettle. If you hear some sizzling or see some bubbling, you know it is working. It only takes a few seconds of contact to permanently dissolve some metal. I suggest testing it on another piece of the same metal that you don't care much about before etching your kettle.
imagem7
It's done.