You also need to determine if the signatures are hand signed or Facsimile signatures. A preprint, or Facsimile signature is simply a photographic copy of an original signed photograph. A Facsimile signature often appears to be below the surface gloss of the photo, and the signature is often very "flat." Hold the photo up at an angle to a light source. A real signature is written on the surface of the photo, and should have a different level of reflectivity than the rest of the surface. A preprint will blend right in with the surface because it's underneath the surface gloss.
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