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In a few seconds he had divested the dead girl of her heavy bodice and skirt and carpet apron and heavy shoes. He rolled the things into a bundle, tossed them into the laboratory, locked the door of the latter, and stuck the key into his pocket. He carefully stopped the bottle containing the remainder of the prussiate of potassium, and took that also.
The remaining solution is the coppering solution; should it not be convenient to separate the yellow prussiate by crystallization, the presence of that salt in the solution does not deteriorate it nor interfere with its power of depositing copper.
Q. I understand you to say you used anhydrous hydrocyanic or cyanhydric acid. A. Yes, sir. Q. Do you sufficiently understand chemistry to use these terms with accuracy? Might you not have used potassium cyanide or prussiate of potash? A. I am a tolerably good chemist, and have spoken understandingly.
But when chemically combined with other substances, its power is in a great measure neutralized, and it becomes a valuable article, both to the chemist as a test, and to the physician as a medicine. The Prussiate of potash and iron will enable the chemist to discover nearly the whole of the metals when in solution, by the colours its combination produces. Dr.
The image is very faint, but on washing in or floating on a moderately strong solution of red prussiate of potash for a minute or less, a blue positive is produced, which is washed in water as usual to fix it. The unused developer produces the best crystals for the purpose, and the pure ammonio-oxalate is vastly better than either.
It may also be obtained from animal substances, although a vegetable acid. The acid may be obtained from Prussiate of potash, by making a strong solution of this salt, and then adding as much tartaric acid as will precipitate the potash, when the acid will be left in solution, which must be decanted and distilled.
The ferri or ferrid cyanide of potassium discovered by Gmelin is often, but improperly, termed red prussiate of potash. It is formed by passing a current of chlorine gas through a solution of ferrocyanide of potassium until the liquid ceases to give a precipitate with a salt of sesquioxide of iron, and acquires a deep, reddish-green color.
If written with a solution of sulphate of iron, and rubbed over with a solution of prussiate of potass, it will appear of a beautiful blue colour. SYRUP OF CREAM. Scald a pint of perfectly fresh cream, add to it a pound and a quarter of powdered lump sugar. Keep it in a cool place for two or three hours, then put it into small phials, holding one or two ounces each, and cork it close.
C.H. Kain, of Camden, N.J., in which the quantity of ammonio-citrate of iron is exactly double that of the red prussiate of potash, and the solutions strong. This gives strong prints of a bright dark blue, and prints very quickly in clear sunlight.
After the second washing, wash the prints over with a strong solution of pyrogallic acid, when the print will develop black, and the ground, if the washings were sufficient, will remain white. A final washing completes the process. If a solution of yellow prussiate of potash be used in place of the pyro solution, a blue print is obtained.
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