I recently found a recipe for granulation paste which includes copper carbonate as one of the ingredients. Does anyone know if this would affect the fineness of the silver for hallmarking purposes ? I was wondering if this would be the case with emersing the granules in copper infused pickle too or if such a small amount on the surface of the silver would make that much of a difference. Maybe I'm not understanding the process enough but would love to give it a go and wasn't sure if I should be using fine silver instead of sterling.
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