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https://jewelrymakingjournal.com/acid-etching-metal-jewelry-part-1/
Set your designs aside and prepare the metal (bronze, brass, copper, or silver) for transfer. The metal needs to be spotlessly clean. Bar Keeper’s Friend is a powdered cleanser (with oxalic acid) that works well to clean off any oil from fingerprints and tarnish on the metal. It also roughens the surface enough to help grab the dry toner.
https://jewelrymakingjournal.com/acid-etching-metal-jewelry-update/
Acid Etching on Metal for Jewelry. You would need a laser copier, transfer paper, an iron, Ferric chloride/Ferric Nitrate etching acid, aquarium bubbler & baking soda for starters (not including metal to be etched). Approximately 1.5 hours time, plus $250 in tools & supplies. And, lots of practice!
https://metalpress.onlinemetals.com/diy-acid-etching/
In short, etching is a process where you use acid to create images on metal. The process involves coating the metal in an acid resistant substance, appropriately called the Resist, then either leaving areas blank or scratching away the cover to make an image. This reveals part of the metal which is then partially burned away (etched) by the acid.
https://www.ganoksin.com/article/goldsmithing-etching-metal/
Etching on metal uses chemical corrosion rather than mechanical force to selectively remove metal. Simply put, the idea is to cloak parts of an object with an acid-proof paint then submerge the piece in acid. The caustic liquid eats away at exposed areas to create a relief, figure 10.64.
https://jewelrymakingjournal.com/acid-etching-metal-jewelry-part-4b/
Acid Etching Metal Jewelry. Part 4b: Etching on Silver Using Ferric Nitrate. . . Continued from Part 4a. HERE IS WHERE I BLEW IT! A 50/50 solution of ferric nitrate takes twice as long to etch silver as ferric chloride does to etch copper and brass.
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