A popular chemistry; . oride (CoCl2) is used as a sympathetic written with a dilute solution of it are invisible when moist withthe H20 absorbed from the air, but on being dried at the stove, againbecome blue. If the paper be laid aside the writing will disappear, butmay be revived in the same manner. A winter landscape may be drawnwith India-ink, the leaves being added with this ink. On being broughtto the fire it will bloom into the foliage of summer. * Its removal is a work of great danger. The workmen are entirelyenveloped in a leathern dress and a mask with glass eyes; they br
A popular chemistry; . oride (CoCl2) is used as a sympathetic written with a dilute solution of it are invisible when moist withthe H20 absorbed from the air, but on being dried at the stove, againbecome blue. If the paper be laid aside the writing will disappear, butmay be revived in the same manner. A winter landscape may be drawnwith India-ink, the leaves being added with this ink. On being broughtto the fire it will bloom into the foliage of summer. * Its removal is a work of great danger. The workmen are entirelyenveloped in a leathern dress and a mask with glass eyes; they breathethrough a moistened sponge, thus filtering the air of the fine particles ofarsenic floating through it. Vet, in spite of all these precautions, theyrarely live beyond forty. ARSENIC. 119 the murder has been committed. The antidote ismilk or white of egg* Marshs Test.—There is no other poison which isso easily detected. Prepare a flask for the evolutionof H. Ignite the jet of gas, and hold in the flame a Pig. Marshs Test. cold porcelain dish. If it remains untarnished, thematerials contain no As. Now pour in through thefunnel-tube a few drops of a solution of As;f thecolor of the flame will be seen to change almost * The exact chemical antidote is hydrated ferric oxide. In this, as inmost other cases of poisoning, where the antidote is not at hand, an emeticshould be taken at once—a tea-spoonful of mustard in a glass of warmwater, or even a quantity of soap-suds. (See Physiology, page 209.) t This is made by dissolving a little As2Os in HC1. 120 INORGANIC CHEMISTRY. instantly, and a copious deposit of As will be formedon the dish. If the tube through which the gas ispassing be heated (see fig. 55), a metallic mirror ofarsenic will appear just beyond the heated place.*The gas formed in this experiment — arseniurettedhydrogen—is very poisonous indeed, and the utmostcare should be used to prevent its inhalation. Arsenic-Eating.—It is said that the peasants in ap
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Keywords: ., bookcentury1800, bookdecade18, booksubjectchemistry, bookyear1887
