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Why we got off at the first station we could, belongs to a little oroide gold watch and Alaska diamond deal we failed to pull off the day before, over the Kentucky line. "When I woke up I heard roosters crowing, and smelt something like the fumes of nitro-muriatic acid, and heard something heavy fall on the floor below us, and a man swearing.
The muriate of gold or platina, formed by digesting these metals in nitro-muriatic acid, must be entirely free from all excess of acid; because it will otherwise act too forcibly on the steel, and cause the coating of gold to peel off.
The process used to be this. The ore which I shewed you just now was taken, and digested in nitro-muriatic acid of a certain strength, and partly converted into a solution, with the leaving behind of certain bodies that I have upon the table. The platinum being dissolved with care in acids, to the solution the muriate of ammonia was added, as I am about to add it here.
It has the property of softening the silver, and bringing it to a state in which it is very susceptible of being either oxidized or iodized, hence it contributes to increase the sensibility of the plate. The proportions are to one drop of acid add from 15 to 20 drops of water, or make the solution about like sharp vinegar to the taste. Nitro-Muriatic Acid.
"As early as 1800," writes Davy, "I had found that when separate portions of distilled water, filling two glass tubes, connected by moist bladders, or any moist animal or vegetable substances, were submitted to the electrical action of the pile of Volta by means of gold wires, a nitro-muriatic solution of gold appeared in the tube containing the positive wire, or the wire transmitting the electricity, and a solution of soda in the opposite tube; but I soon ascertained that the muriatic acid owed its existence to the animal or vegetable matters employed; for when the same fibres of cotton were made use of in successive experiments, and washed after every process in a weak solution of nitric acid, the water in the apparatus containing them, though acted on for a great length of time with a very strong power, at last produced no effects upon nitrate of silver.
Bromine and its Compounds Iodine and its Compounds Chlorine and its compounds Cyanide of Potassium Hyposulphite of Soda Hyposulphite of Gold Nitric Acid Nitro-Muriatic Acid Hydrochloric Acid Hydrofluoric Acid Sulphuric Acid Accelerating Substances Liquid Sensitives Dry Sensitives, etc., etc.
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