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Scientific chemical suppliers, such as those used by schools, or old-fashioned chemists shops should have the acid in suitably small quantities. I have not found the dilution to be critical -...

Use dilute phosphoric acid (remember - acid to water, not water to acid) and immerse for as long as is required to get the etch you want. Brush off the muck & bubbles occasionally so you can see how...

If laminated or Damascus steels are polished smooth the pattern is lost. It is made visible again by acid etching, which affects the two types of steel of which these composite steels are made to...