Hey guys, long time lurker first time poster, I've picked up some silver and gold ($10 coins and 1982 $200 coin etc) along with that lot, I got a bulk lot of 2cent coins, for fun I looked for some non SDs, and found at least two, which was nice. My question is, with the 'dirty' coins, anyway to clean them to see if the SD is there or not?
The no SD is apparently a minting error, leaving off the initials of the artist http://blog.perthmint.com.au/2012/07/20/why-two-cent-coins-are-being-hunted-by-collectors/