www.finishing.com"Glyceregia is a common etchant for nickel-based alloys. The composition and use instructions are as follows:
15 mL HCl
10 mL glycerol
5 mL nitric acid
Mix fresh for each use-- do not store. Swab the etchant, do not immerse. It has a useful life of < 20 minutes. As it turns color, it becomes overly aggressive. When orange, it can give off Cl gas. Do not breathe in the fumes (use under a hood). Discard properly after about 20 minutes."
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