What is a common corrective action for inconsistent silver staining?

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Reagent freshness and pH control are crucial for consistent silver staining. The ammonium hydroxide helps form the ammonia-silver complex that drives the development step; if the bottle is old or has absorbed CO2, it can become degraded or shifted in pH, leading to variable silver deposition and patchy backgrounds. Using a fresh bottle of ammonium hydroxide provides a stable, known concentration and pH, which standardizes the development reaction and yields uniform staining across sections.

Other adjustments don’t address the underlying cause of inconsistent staining as directly. Increasing toning time with gold chloride can change contrast but won’t fix variability from degraded development reagents. Extending washing between steps can reduce nonspecific background, but it doesn’t restore reagent quality or the consistency of silver deposition.