The Royal Canadian Mint has announced Mintshield, a new technology the RCM reports will minimize and even inhibit the future appearance of white spots on its Maple Leaf silver bullion coins. Images courtesy of the Royal Canadian Mint. The week is winding down, and it’s time to catch up on what happened in the numismatic world. To look back at Coin World's five most-read stories of the week, click the links to read the stories. Here they are, in reverse order:5.