DEFECTS OF DRYING

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Shorelines

Film dried too quickly, usually due to too high a temperature, will exhibit shorelines. These are visible as definite contour lines often starting from the perforations.

Drying marks

These are a term for any mark left as a droplet of water dries.

Inadequate squeegees are the most common reason, but hard water produces the worst marks and pure water, especially distilled water produces virtually no marks even with poor ineffective squeegees.

Dirt

The main cause of dirt is a dirty drying cabinet, or dirty or ineffective air filters and is seen on positive film on projection as fine black specks, and on negative film will print as white specks [and is called sparkle].

The drying cabinet requires a high level of cleanliness. Any dirt in the cabinet will blow onto the wet film and stick to the drying emulsion and it may not be possible to remove this dirt without a great deal of difficulty, if at all.