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*Carbon and Low-Alloy Steels* Three acids will work to etch low carbon steel: nitric acid, ammonium persulfate, and iodide/potassium iodide. Mix as follows. Nitric Acid - mixture of 5 - 10% nitric acid with the balance being alcohol. Water will work, but alcohol is preferred. Ammonium Persulfate - Mix one part ammonium persulfate to nine parts water by weight. Apply with a cotton swab. Iodide and Potassium Iodide - Mix one part iodide, two parts potassium iodide and ten parts water by weight. Apply with a brush at room temperature. *Stainless Steel* For stainless steels stick with the following mixture. Apply at room temperature with a cotton swab or immerse the part in the solution. 200g ferric chloride (FeCl3) + 300mL nitric acid (HNO3) + 100mL water (H20)

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Enthanol -90% Nitric Acid-10%