Chinese first to fourth-century coins, like these found in North Khotan, were widespread until the seventh century. They were tied together with a string through the hole and some have corroded together. These are called wuzhu because of the inscription which means ‘five grains’.
Found this looking for a way to clean coins as SOMEHOW we have ended up with a BUNCH of corroded coins and I think this is a great idea to do with the kids and their abundance of coins ... and will help with counting and money skills maybe..hopefully..LOL
Odysseus from the Antikythera wreck, a shipwreck from the 2nd quarter of the 1st century BC discovered by sponge divers off Point Glyphadia on the Greek island of Antikythera in 1900.The wreck manifested numerous statues,coins and other artifacts dating back to the 4th century BC,as well as the severely corroded remnants of a device that is called the world's oldest known analog computer, the Antikythera mechanism.
A lot of new coin collectors - and those who don’t know much about coins - think it is good to clean coins. It's NOT. Cleaning a coin almost always ruins the coin. Is it ever okay to clean a coin? Yes, there are exceptions to the rule!