Granular deposition of silver is observed on the Gordon and Sweets reticulin control. What is a possible explanation?

• A. The reagents may have been old
• B. The slide was fixed too long
• C. The stain was too dilute
• D. The cover glass was contaminated

Answer: (A)

In silver impregnation methods like Gordon and Sweets reticulin, a crisp, uniform black reticular network depends on fresh, properly prepared reagents and a controlled development step. When reagents are old, their chemical integrity degrades; silver salts can form colloidal silver or oxidize in storage. During development, these degraded reagents don’t reduce evenly, leading to granular, clumpy deposits of silver rather than a smooth, continuous reticular network. Seeing granular silver on the Gordon and Sweets reticulin control points to a problem with reagent quality, making old reagents the most plausible explanation.

The other possibilities don’t fit as well. Fixation for too long tends to fade or alter staining intensity rather than produce discrete granular deposits. If the stain were too dilute, the result would be faint staining overall, not granular granules. Contaminated cover glass could introduce particulates, but it would typically show nonspecific specks or overall surface contamination rather than a patterned granular deposition specifically on the reticulin control.