Metal Leaf is a micro-thin sheet of metal separated by pages of tissue paper. All through history in the world of decorative arts, gold leaf has played a very prominent role. Pure precious metals continue to exemplify quality and good taste. Mona Lisa leaf products and techniques make the leafing process fun and foolproof with satisfying results every time. Sterling Silver Leaf is made of pure silver. It reacts the same as Sterling Silver and will tarnish if it is not sealed.