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 some information about the life, industry and culture of the Urals and which the author tried to include into every edition of the collection. Later versions contained more than 40 stories. Not all stories are equally popular nowadays. The most popular tales were written between 1936 and 1939: "The Mistress of the Copper Mountain" and its continuation "The Malachite Casket", "The Stone Flower" and its continuation "The Master Craftsman", "Silver Hoof", "Cat's Ears", "Sinyushka's Well", "The Manager's Boot-Soles". Among the later stories, "A Fragile Twig" (1940), "The Fire-Fairy" (1940), "Tayutka's Mirror" (1941), "Ivanko Krylatko" (1943), "That Spark of Life" (1943)