What is a common cause of inconsistent silver staining?

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Silver staining relies on a stable chemical environment during development, where the silver ions are reduced to metallic silver in the tissue. The development step uses ammonium hydroxide to adjust pH and enable proper reduction. If the ammonium hydroxide is old, it can lose potency or become contaminated (even absorbing CO2 to form ammonium carbonate), which shifts the pH and alters how silver is reduced. That causes uneven development and patchy, inconsistent staining across sections. Using a freshly prepared ammonium hydroxide helps maintain the correct conditions for uniform reduction and consistent results. The gold chloride toning step affects color and contrast after staining, not the consistency of the staining itself, and inadequate fixation mainly causes tissue preservation issues rather than specifically causing variability in the silver deposition.