Fuchsin

... have a cell wall made up of glycolipids, in particular mycolic acids and these are resistant to acid staining, only retaining the carbol fuchsin, making them appear red and gram negative. If the organisms look purple, then these have been decolourised and therefore do not need acid fast ...

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... the crystal violet-iodine complex. These need counterstaining with another dye to be seen using Gram's method. A red dye such as dilute carbol fuchsin is often used. Lysogens are bacteria that have been stably infected with a bacteriophage and that carry the virus as a 'prophage'. The bacteriophage ...

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... observed "filaments" in the cytoplasm of other cell types. In 1890 Altmann discovered a method of staining these structures with fuchsin that made it possible to demonstrate their occurrence in nearly all types of cells. He interpreted them as "elementary living particles, ...

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