Which processing error causes films to turn yellow-brown and smell like sulfur?

• A. Oxidized Developer
• B. Weak Fixer
• C. Cold or Non-Circulating Wash Water
• D. Above Normal Developer Temperature

Answer: (C)

The key idea is that proper washing is essential to remove fixer from the film and tanks. When the wash water is too cold or not circulating, fixer residues aren’t thoroughly rinsed off. Those fixer residues, especially thiosulfate-based fixer, can leave a yellow-brown stain on the emulsion as they oxidize and interact with the silver halide remnants. At the same time, lingering fixer and stagnant wash water create an environment where sulfur-containing compounds or bacterial activity can produce a sulfur-like odor.

If the film were affected by oxidized developer, you’d see overall loss of density or contrast changes rather than this brown staining with a sulfur smell. A weak fixer would cause incomplete fixation and potential milky areas, not the characteristic yellow-brown stain coupled with a sulfur odor. An above-normal developer temperature would intensify development and darken the film rather than cause this staining and odor.