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Common issues can be resolved as follows. For clumping, gently tap the reagent bottle with a wooden mallet—never use a metal hammer. Darkening color indicates partial oxidation, which can be treated by refluxing with an appropriate amount of sulfur powder. Cloudy solutions should be filtered before concentration calibration, using double-layer slow quantitative filter paper. If the Sodium Sulfide reagent bottle label falls off, immediately rewrite it using a waterproof marker, noting the opening date.Sodium Sulfide.