Silver Plating

Same way it was put on. An electroplating set up and reverse the polarity. It will remove the plating and unfortunately a little of the surface of the coin as well, but that is the least damaging way to do it. If you us a silver bearing solution for your eletctrolye it will be a little more selective at removing the silverplating.

Um, both of these coins are actually made of silver. Why would anyone silver-plate a silver coin, and how can you tell they've been plated?

Thanks all! yes, they are silver plated, very difficult to show on picture but once in hand, I am sure you will notice it.

Silver plated coins are easy to find in Asia,I usually come across them. Yes it looks like dipped but when overdone like these two, they become weak strikes uniformly all over, another thing is the shine or sheen, a 90% silver has a different sheen than a 100% silver and its very evident when in hand.

As experimentation for expendable coins, I'll try Conder 101's comments, just to see, they are done & cooked anyway.

Thanks again!