This silver casket, believed to have been owned by Mary, Queen of Scots, is one of Scotland’s most cherished treasures 👑 It’s a very beautiful and rare example of early French silver. But, when it first came in to the collection at National Museums Scotland, it was covered in a dark layer of tarnish. So, the casket underwent a (very gentle) process of conservation. There’s a very fine layer of gold over the decoration in some areas, so a pen device was used to remove the tarnish without damagin