Renaissance wax can be used on almost anything. It was formulated in England I believe and museums use it on leather, wood, swords and yes on Roman coins, both silver and bronze. I wouldn't hesitate to use it on silver coins.
Some older discussions on the use of ren wax on coins, both ancient and modern, here and here. As Oxos stated, the ren wax formula was originally invented by the British Museum for artefact preservation, and as far as I know the entire British Museum coin collection has been ren waxed, gold, silver and base-metal.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Thanks guys. I have lots of bronze. Just got my first medieval silver. It looks more like silver than some coins I have from the 60's so I wasnt sure if I should use it.
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