Dejan
Ma9nWaRr10
Corroded and then chemically cleaned coins. Likely from metal detecting. I've seen many metal detecting videos and most soviet coins from the ground look like that, specially if they were found on agricultural land or in water.
While it might be the case, why on Earth would someone take the trouble to do this for coins of absolutely no value?!
These coins are a byproduct of searching for other, more valuable things (tsar's coins, other silver/gold coins or other objects, crosses, ancient arrowheads, etc). And were cleaned chemically, because it is the easiest way to clean not valuable items. You just need to toss them in hydrochloric or sulfuric acid and take them out few minutes later. Both are easily obtainable and cheap (used for example for swimming pool maintainance).
On the question why, I think, it is to make them a bit more appealing, and stop further corrosion. The coins didn't loose any value anyway, but certainly look better than whatever they looked before.
