Malachite green is retained in catfish muscle longer (HL = 10 days) than is the parent molecule (HL = 2.8 days). The (oral, mouse) is 80 mg/kg. Rats fed malachite green experience "a dose-related increase in liver DNA adducts" along with lung adenomas. Leucomalachite green causes an "increase in the number and severity of changes". As leucomalachite green is the primary metabolite of malachite green and is retained in fish muscle much longer, most human dietary intake of malachite green from eating fish would be in the leuco form. During the experiment, rats were fed up to 543 ppm of leucomalachite green,
The Malachite Box Fairy Tale" (), based on "The Mistress of the Copper Mountain". Based on "Marko's Hill", Klara Katsman created the operetta "Mark Beregovik" (), which premiered in Sverdlovsk in 1955. Lyubov Nikolskaya composed the children's opera "Silver Hoof" based on the story of the same name in 1959. Vladimir Goryachikh composed the ballet "The Living Stone" () based on "Sinyushka's Well", which premiered in Nizhny Tagil in 1965. The 1973 opera "The Fire Maid" (based on "The Fire-Fairy") for schools was composed by Robert Long, with story adapted and lyrics by Dorothy Gulliver The 2012 opera "The Malachite Casket", based on