The Hahnemühle Certificate of Authenticity was designed to protect the security & genuineness of your limited edition art works & reproductions on Hahnemühle paper & to reduce the risk of forgery. Each certificate is made from premium deckle edged mould made paper with a Hahnemühle watermark & fluorescent security fibres. A serialized numbered hologram should be added. A second, identically numbered hologram should then be applied to the reverse side of the artwork. The combination of certificate & hologram assures that each Certificate of Authenticity relates to one particular piece of art.