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Etching the Die Ring for a Elongated Penny Machine

The die ring is case hardened steel. I am using KTFR Photo-Resist, pre-baked and post-baked. I have been using Nitric Acid diluted 3/1 with a DC current of about 15 Volts at .80-Amps. The actual etching takes several minutes and gives a nice clean etch. It does not etch as deeply as I would hope it would. I have heard about ferric chloride ⇦ on eBay or Amazon [affil links] etching and was wondering if this would work on the case hardened steel and would possibly eliminate the need for the DC current. Any words of wisdom would be appreciated.

Lee Bowser
designer and hobbyist - Alexander, Arkansas USA
June 9, 2009
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