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 the Urals. The first short version of the essay, included in the 1939 book, was titled "The Watchhouse on Dumna Mountain". In 1940 the author expanded it and renamed to "By the Old Mine" (). This version was first published in the 3rd volume of the "Uralsky Sovremennik" almanac (1940). Starting with the 3rd edition of "The Malachite Box", this essay was published in all subsequent editions. The author included the essay in every "The Malachite Box" edition for the purpose of familiarizing the reader with the unique culture of the Ural region. "Beloved Name" (alternative translation: That Dear Name)