Original Message:   It takes weeks in an electrolytic solution

You don't want to etch away the underlying silver/copper, just de-oxidize it. People who do conservation for marine salvage and archaeology have lots of technical knowledge and skill on this topic, but I don't know how much is available for free. At any rate, DO NOT apply any sort of solvent. The baking soda/aluminum foil/hot water method is an electrolytic technique for silver only. But I would never try it on something old, would do my best to find a professional conservator first. Copyright 2024 All rights reserved by Bead Collector Network and its users

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