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 "The Mistress of the Copper Mountain" and "The Malachite Casket", was created by Dmitry Batin. Two filmstrips were released, "The Fire-Fairy" (1956) and "The Malachite Box" (1972). "The Stone Flower" was adapted for stage many times. The first ballet of the same name was created by Alexander Fridlender in 1944. The opera in four acts "The Stone Flower" by Kirill Molchanov premiered on 10 December 1950 in Moscow at the Stanislavski and Nemirovich-Danchenko Music Theatre. Sergey Severtsev wrote the Russian language libretto. It was the first opera of Molchanov. The role of Danila (tenor) was sung by Mechislav Shchavinsky, Larisa