Trial Proof
An impression pulled before the edition in order to see what the print looks like at that stage of development, after which the artist may go back to the matrix and make adjustments. There can be any number of trial proofs, depending upon how a particular artist works, but it is usually a small amount and each one usually differs from the others. In French, a trial proof is called an epreuve d'essai, in German, Probedruck.