Malachite green metabolized into LMG. Only the cation MG is deeply colored, whereas the leuco and alcohol derivatives are not. This difference arises because only the cationic form has extended pi-delocalization, which allows the molecule to absorb visible light. The leuco form of malachite green was first prepared by Hermann Fischer in 1877 by condensing benzaldehyde and dimethylaniline in the molecular ratio 1:2 in the presence of sulfuric acid. Malachite green is traditionally used as a dye. Kilotonnes of MG and related triarylmethane dyes are produced annually for this purpose. MG is active against the oomycete "Saprolegnia", which infects fish eggs in
The Malachite Box was presented to the author for his 60th birthday on 28 January 1939. Several test copies were published in January. A special deluxe edition, decorated with malachite, was sent to the 1939 New York World's Fair. The mass market edition published in autumn of the same year. The book was an instant success. It has been republished many times. Overall, twenty three editions of the stories were released from 1941 to 1945. The second edition of the collection was released by the Moscow publishing house Sovetsky Pisatel in 1942. The book was awarded the Stalin prize. The third edition of