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 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)