i saw a movie on you tube on how they engrave a battle axe with salt water and 12 volts electric power and i did want to know if that works to use that later on some reels to engrave.
I took a piece metal plate and cleaned the surface very well and sprayed it in with gray paint. when the paint was dry i put a drawing on the plate from a Mordex Merlin decal and resized it to a 9 cm diameter. When the drawing was done i scratched the drawing in the paint layer with a sharp pin so the bare metal showed up on the complete picture. use a salt water saturated solution and use a battery loader 12V for the power that is needed to activate the process, a dirty black substance appeared so i could see something was going on :-) after 30 minutes it was done and the result was not bad for the second attempt but still have to practice a few times to get the best results
The picture i used, Mordex Merlin decal
Black magic :-)
The result
