Decolourized Fuchsin Solution
Dissolve 0.1 g of basic fuchsin in 60 ml of water. Add a solution of 1 g of anhydrous sodium sulfite (Reagent grade) in 10 ml of water. Slowly and with continuous shaking of the solution add 2 ml of hydrochloric acid. Dilute to 100 ml with water. Allow to stand protected from light for at least 12 h, decolourize with activated charcoal and filter. If the solution becomes cloudy, filter before use. If on standing the solution becomes violet, decolourize again by adding activated charcoal. Store protected from light.