-Abrasion marks - marks on the emulsion surface of a film, caused by scratching. It can be due to traces of dirt trapped between layers of film as it is wound on the spool, or to grit on the pressure plate.
Table 11-1-Print Defects Defect Appearance Cause Prevention Abrasion marks or streaks. Surface of paper abraded Friction or rubbing on Store paper boxes on or scratched; results in the surface of the paper.
 See also: Developer, Processing, Emulsion, Photography, Back
  
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