Copper Leaf Patent - Pack Pack contains 20 Books or 500 Leaves Copper Leaf is made from pure copper. The copper alloy in metal leaf will tarnish, therefore all metal leaf must be sealed to prevent tarnishing. It is best to wear gloves when handling metal leaf to avoid leaving fingerprints and other residues that may cause the leaf to discolor under the sealer. Average Coverage area for a book is 5.25 square feet Average Coverage area for a pack is 105 square feet This is Patent or Transfer leaf, each leaf is mounted to special tissue paper.  Copper Leaf - Pack