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Updated: June 23, 2025
"Somewhat curious," assented the Inspector; "you see our batteries require a good deal of shelving. All put together, there is in this room about three miles of shelving, completely filled, as you see, with about 22,000 cells or jars. The electricity is generated in these jars. They contain carbon and zinc plates in a solution of bichromate of potash and sulphuric acid and water.
During distillation pass some of the vapour into concentrated solution of bichromate of potash, nitric and sulphuric acids, and note reaction as for alcohol. Tests. Vapour burns with smoky flame, depositing carbon. Sparingly soluble in water. With bichromate of potash and sulphuric acid same as alcohol.
This operation, however, is very simple, and may be performed every time the battery is visited in order to see what state it is in. We regard Mr. Mareschal's apparatus as an indispensable addition to every case of domestic electric lighting in which bichromate of potassa piles are used, and, in general, to all cases where the pile becomes uselessly exhausted in open circuit.
This discovery led to no immediate practical result, and it was not until twenty-one years after that a further discovery was made, which may indeed be said to have achieved a world-wide reputation. It was found that, by adding bichromate of potash to a solution of aniline and sulphuric acid, a powder was obtained from which the dye was afterwards extracted, which is known as mauve.
In that case I employ the following formula: Dry albumen from eggs.............. 15 to 20 parts Water.............................. 100 " Ammonia bichromate................. 2.50 " Always add some drops of ammonia, and keep this mixture in a well corked bottle and in a dark place.
It was contrived from an old cheap watch-case, while the strange contents were merely strips of paper which had been soaked in a solution of potassium bichromate! These preliminaries completed, my two companions and I were paraded before another pompous official who, like the majority of his ilk, was smothered with decorations.
Sulphuric acid and bichromate of potassium give a green colour, oxide of chromium. Precipitate with bichloride of platinum and with carbazotic acid. Much used in America by the Coffenite practitioners, and a valuable remedy for asthma. Symptoms. Nausea, vomiting, giddiness, cold sweats, prostration. Headache, giddiness, tremors, insensibility, and convulsions.
Those engaged in their manufacture suffer from unhealthy ulcers on the nasal septum and hands. The former may to some extent be prevented by taking snuff. Two drachms of the bichromate caused death in four hours. Tests. Yellow precipitate with salts of lead, deep red with those of silver. Treatment. Emetics, magnesia, and diluents.
A further inspection of the dissected compounds above shows that six molecules of FeO.SO were required to react with the three atoms of oxygen from the bichromate. From the two equations Since the ferrous sulphate crystalline form has the formula FeSO .7H O, a normal reducing solution of this crystalline salt should contain 277.9 grams per liter. !Approximate Strength 0.1 N!
It was the shade of purple called mauve, and the chief agent in its production was bichromate of potash. This salt is not actively poisonous, and no one thought of attributing injurious properties to materials dyed with the aniline mauve. Next in chronological order came magenta red.
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