Which statement best describes the effects of humidity on film quality?

• A. Low humidity increases static marks.
• B. High humidity makes films sticky and difficult to handle.
• C. Both statements are true.
• D. Humidity has no effect on film quality.

Answer: (C)

Humidity affects film quality by changing how the film behaves in two key ways: static electricity and surface tackiness. In a dry environment, static charges can build up on the film as it moves through cassettes and rollers or while being handled. When these charges discharge, static marks appear on the film, creating artifacts that can obscure details. In a humid environment, moisture makes the film surface tacky, so the film sticks to gloves, fingers, or handling equipment, increasing the risk of fingerprints and handling-related artifacts and making it harder to manage without damaging the film. Because both issues real and distinct, both statements are true. Humidity does influence film quality, so saying it has no effect is not correct. The practical goal is to maintain moderate humidity to minimize both static and tackiness.