Removing silver stains

[ldanielrosa]

TL;DR

I brought contaminated items into the kitchen

I should know better. Really I should. But I did it.... again.

While refining silver from various scrap, some of the jars "migrated" into the kitchen. I thought they were empty, and I thought I'd cleaned the bottoms. Now there are purple spots on the kitchen counters.

Is there a method to removing silver stains from countertops?

 

[.Scott]

Is this a stone counter top or something else?
And, of course, you are looking for a solution short of replacing the counter.