Which of the following cause the FILMS to SMELL and turn YELLOW over time?

• A. 1 and 2
• B. 1 and 3
• C. 2 and 3
• D. 1, 2, and 3

Answer: (B)

Film deterioration over time is driven by chemical changes in the emulsion caused by processing residues and by storage conditions. The odor you notice comes from volatile byproducts released as residual chemicals (like fixer or developer remnants) slowly break down, especially when heat or humidity are present. Yellowing, on the other hand, results from chemical staining and oxidation within the emulsion or from leftover fixer reacting over time. When both processing residues are not properly removed and storage conditions promote chemical reactions (heat, moisture, and exposure), you get both a noticeable odor and yellow discoloration. This combination explains why the pair of factors represented together best accounts for both symptoms. The factor shown alone in the remaining option doesn’t typically produce both odor and yellowing, so the combined factors are the most accurate explanation.