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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.

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abrasion marks

Scratches on film caused by dirt, improper handling, grit, emulsion pileups, and certain types of film damage (e.g., torn perforations).
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