The Hahnemühle Certificate of Authenticity was designed to protect the security and genuineness of your limited edition art works and reproductions on Hahnemühle paper and to reduce the risk of forgery. Each certificate is made of premium deckle edged mould made paper with a Hahnemühle watermark and 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.