In the Gordon and Sweet reticulin stain, silver disposition varies from black granules to completely black nuclei. What is a documented cause?

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Silver impregnation in Gordon and Sweet reticulin staining is time-dependent during the metallic salt step. Reticular fibers take up silver and appear black, but the extent and localization of that blackening depend on how long the tissue sits in the metallic salt solution. If the tissue stays too long, silver continues depositing beyond the fibers and can accumulate in nuclei, producing completely black nuclei. This prolonged exposure to the metallic salt solution is a documented cause of the pattern where staining ranges from black granules in fibers to fully black nuclei. Keeping the timing precise is crucial because too short a exposure may yield only faint or granular fiber staining, while too long leads to over-staining, including nuclear blackening.