Gauges used for spark plugs have a bunch of high quality carbon steel leaves to practice on.
Make several etches on each face, sand them off to see how durable they are, test different pads and electrolytes and voltages.
Oil them after you etch, since they flash rust.
Make several etches on each face, sand them off to see how durable they are, test different pads and electrolytes and voltages.
Oil them after you etch, since they flash rust.
