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sodium bisulfate -- for pickling with copper alloys or if you are in a group-studio situation. I have one pickle pot that I use for all metals, and I haven't had any trouble. However, it's not a bad idea to avoid any cross-contamination; it's possible that contamination in the form of copper deposited on the surface of the Argentium sterling could affect tarnish resistance.
Please let me know if you need any clarification. I'm always happy to answer your questions.
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