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"Step 1: What you'll need. Supplies -- Ferric Chloride" It's the first thing listed in the very first step.Fry's Electronics carries it. I picked up a gallon a while back for about $20 which should last you a long, long time.FeCl3 will etch darn near any metal including Iron and Nickel-based alloys, Stainless Steel, Copper, Brass and Zinc, to list a few. Don't be sloppy, it'll stain just about everything brown including your skin and clothing.