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 Casket (fairy tale) Her appearance resembles that of the Mistress of the Copper Mountain. A female vagabond comes to their house and stays for a while, teaching Tanyushka silk embroidering. Nastasya is not happy with the arrangement, because she feels that Tanyushka "doesn't want to come to her own mother, but hugs a tramp". Nevertheless they become very close. One day, when the woman is alone with Tanyushka, the girl shows her the jewellery from the Malachite Casket, and in return the woman shows her a vision of a beautiful room decorated with malachite. She explains that the Malachite Room of the Tsar's