United States or Western Sahara ? Vote for the TOP Country of the Week !


An excess of the ferrous salt in the ferrous oxalate developer; and when this is the case, the yellow compound salt is more in suspension than solution, and in the course of development it is deposited upon, and at the same time formed in, the gelatinous film.

Anyway, we hammered away at the subject, only stoppin' to make coffee and sandwiches, until near two o'clock in the mornin'. "Help!" says I, glancin' at the nickel alarm clock. "My head feels like a stuffed sausage. A little more, and I won't know whether I'm a nitrous sulphide or a ferrous oxide of bromo seltzer. Let's take the rest in another dose."

They ate bolts, nuts, the nails out of shoes, pocket knives and pants buttons, zippers, wire staples and the tacks out of upholstery. Gnawing even threads and filings of metal away, they made visible gaps in the frames and moving parts of farm tractors. Moreover, it appeared that their numbers previously had been held down by the paucity of ferrous compounds in their regular diet.

The most important combinations among the foregoing are: Potassium bichromate and ferrous salts; potassium permanganate and ferrous salts; potassium permanganate and oxalic acid, or its derivatives; iodine and sodium thiosulphate; hypochlorites and arsenious acid.

Now while these proportions may be the best for the development of a negative, they are not, according to my experience, the best for gelatine bromide positive enlargements; I find, indeed, that potassic oxalate should not have more than one-eighth of the ferrous sulphate solution added to it, otherwise it will not hold in proper solution for any length of time the compound salt formed when the two are mixed.