Fingerprint marks

Black fingerprint marks on radiograph.

White fingerprint marks on radiograph.

Possible causes:

  • Developer solution on fingertips will produce black markings on the final radiograph.
  • Some fluorides, notably stannous fluoride, will produce black artifacts on a radiograph if it has contact with exposed but unprocessed film.
  • White fingerprint marks can be caused by fixer solution or oily substances on the fingers that prevent the emulsion from developing.