Plating over nickel
Sure you can plate nickel or copper over nickel but first you must:
1. THOROUGHLY clean the nickel
2. Activate the nickel with Pickle #3 which is the sulfuric acid mix.
Don't under-estimate the difficulty of cleaning the old nickel. It might be advisable to give it a light sandblasting to remove all traces of oxidation and pitting, scour flat with Britex wheel or SOS pad, then continue on with the restoration.
If the nickel is freshly plated, then of course you'll want to focus on cleaning to successful water break, then activating it.
Kind regards,
Ken
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