Which processing error causes radiographic films to appear yellow-brown and emit a sulfur-like odor?

• A. Weak fixer solution
• B. Above normal developer solution temperature
• C. Oxidized or depleted developer solution
• D. Cold or non-circulating wash water

Answer: (D)

The effect shown is caused by inadequate washing to remove fixer residues. After fixing, films must be thoroughly washed to rinse away thiosulfate and other fixer chemicals. If the wash water is too cold or not circulating, diffusion and flushing of these residues are hindered, so fixer remains on the emulsion. Residual fixer can oxidize or interact with the emulsion to produce a yellow-brown stain, and the sulfur-containing compounds in fixer can give off a sulfur-like odor. The other processing faults involve different symptoms (overdeveloping with high temperature, developer depletion causing fog, or poor washing being the main culprit here), but they don’t explain both the yellow-brown discoloration and the sulfur odor together as this scenario does.