Malachite green result. Numerous niche applications exploit the intense color of MG. It is used as a biological stain for microscopic analysis of cell biology and tissue samples. In the Gimenez staining method, basic fuchsin stains bacteria red or magenta, and malachite green is used as a blue-green counterstain. Malachite green is also used in endospore staining, since it can directly stain endospores within bacterial cells; here a safranin counterstain is often used. Malachite green can also be used as a saturable absorber in dye lasers, or as a pH indicator between pH 0.2–1.8. However, this use is relatively rare. Leuco-malachite green
Italian submarine Malachite Spezia. In 1937 she undertook a training campaign near the Greek coast, in the Dodecanese and around Tobruk. During the Spanish Civil War, the submarine conducted a special mission between 24 August and 4 September 1937, and on August 29 she was subject to a anti-submarine search and attack. Between 1938 and 1940 "Malachite" was training and exercising for long periods around Tobruk. Upon her return to Italy, she was assigned to 47th Squadron (IV Submarine Group) based at Taranto. At the time of Italy's entrance into World War II, "Malachite" was reassigned to the X Submarine Group based at