Which combination best explains crystals on the film?

• A. Crystals on film
• B. Insufficient washing
• C. Fogged film
• D. Scratched

Answer: (B)

Crystals on the film appear when residual processing chemicals, specifically fixer salts, remain on the film and crystallize as it dries. After development, the film must be thoroughly washed to remove unreacted fixer. If washing is insufficient, fixer salts stay on the emulsion surface; as drying occurs these salts precipitate into tiny crystalline deposits that look like crystals. This is different from fogging (which dulls overall contrast), scratches (physical damage), or a description that alone doesn’t point to a cause. To prevent it, ensure adequate washing time and agitation and use fresh wash water to remove all fixer residues.