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
Malachite Room of the Winter Palace of the Government were arrested in the adjoining private dining room. Today, as part of the State Hermitage Museum, this room retains its original decoration. Citations Bibliography Malachite Room of the Winter Palace The Malachite Room of the Winter Palace, St Petersburg, was designed in the late 1830s by the architect Alexander Briullov for use a formal reception room for the Empress Alexandra Fyodorovna, wife of Nicholas I. It replaced the Jasper Room, which was destroyed in the fire of 1837. The room obtains its name from the use of malachite for its columns and fireplace. This large salon contains