This is a piece of hot rolled mild steel plate I electro-etched to about 1/16" depth. I made a stencil from heavy duty, self adhesive vinyl, attached an electrode to the back of the blank, attached the stencil, and sealed the rest of the blank, except the lettering, to confine the etch to just the letterforms. Instead of etching it with a swab, the entire blank was submerged in a tub of saturated brine, along with a separate electrode made from another piece of steel. If I'm not mistaken, the etch took about 30 minutes, but I don't have the details in front of me (time, voltage, polarity, and current). It was easy enough that this was just my first attempt after running a test piece, and it turned out nicely. When I get around to it, I want to try it on designs with both broader etched areas, as well as finer details.