The Guarantees:

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• Engraving: "A picture drawn  on a hard surface, whether through a pointed instrument  or chemically through corrosive substances" (Devoto-Oli). The die must be engraved by hand by the artist.

• By hand: The print must be done by a hand press.

• Signed and numbered: Every engraved work must be signed and numbered (numerator and denominator) by the artist,  with a pencil and on every sheet.

• Limited edition:  For technical reasons and for its value, the edition  must never overcome a limited number of engravings.

• Numbered proof: Also every  print proof must be numbered.

• Staked out slab: When the edition is concluded the die must be staked out (slashed) in order to avoid further editions. 

• Written guarantees:  Every engranving must have the editor's blank stamp and must be accompanied with its guarantee certificate which ceritifies the engraving's originality, the technique, the artist, and the staked out slab.

(as required in Bertarelli Declaration, Milan, Italy)