In today modern prints domain, after the edition is completed, the artist signs in pencil each of his proofs. In doing so, he is able to control the edition and put away prints that are not entirely satisfactory. In addition, certain prints have a printed signature which means that the artist has signed the stone itself for a lithograph or the copper plate for an etching. But, the artist might also add an original signature to this composition. One can also find prints that are unsigned or prints that should not be.