1) The matrix (plaque used to make the impressions) is created by the artist
2) The multiples are printed by the artist or by a technician supervised by the artist
3) Each impression is approved and signed by the artist
There are different types of proofs. All proofs are impressions printed as part of the edition process. Sometimes proofs are unique and different from the final edition. The value of these prints is equal to those in the final edition because they comply with the same standards: 1) the matrix is created by the artist, 2) the proofs are printed by the artists or a technician supervised by the artist, and 3) the proofs are authorized and signed by the artist.