Malachite green (LMG) is used as a detection method for latent blood in forensic science. Hemoglobin catalyzes the reaction between LMG and hydrogen peroxide, converting the colorless LMG into malachite green. Therefore, the appearance of a green color indicates the presence of blood. In 1992, Canadian authorities determined that eating fish contaminated with malachite green posed a significant health risk. Malachite green was classified a Class II Health Hazard. Due to its low manufacturing cost, malachite green is still used in certain countries with less restrictive laws for non aquaculture purposes. In 2005, analysts in Hong Kong found traces of malachite 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)