Something to try using supermarket chemicals.
How to REFINE SILVER using baking soda, Karo pancake syrup, table salt, Caustic Soda and water:
First dissolve your silver in nitric acid. You can do this in a plastic bucket but be sure to wear protective clothing like rubber gloves and to do it out of doors.
When the silver is all dissolved, pour the acid into another plastic bucket. Be sure not to pour any particles along with the acid.
Add ordinary table salt to the acid until the salt stops making white clumps in the acid. Pour off the acid.
Add baking soda to the acid to neutralize it.
Do not pour off the white "precipitate" that the salt formed. This is pure silver chloride.
Rinse the silver chloride with water. To the silver chloride add Caustic Soda (lye) until all the silver chloride has turned black. Rinse with water. Add Karo syrup (Corn Syrup) until all the black material (silver oxide) turns to pure silver
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