sulphocyanide

It is very inferior to that in No. 3, the color less pleasant, and the appearance generally as if the details of the lights had been bleached by the large quantity either of hypo or of sulphocyanide of potassium.

Scientific American Supplement, No. 586, March 26, 1887 Various

The general lesson taught by Clark's experiments is that the sulphocyanide bath gives better results than any other.

Scientific American Supplement, No. 586, March 26, 1887 Various

The formation of the ammonia produced in the process is probably due to the decomposition of nitrogenous bodies contained in solution in the liquor -- the sulphocyanide, for instance; the nitrogen being given off in the form of ammonia.

Scientific American Supplement, No. 611, September 17, 1887 Various

They are decidedly more pleasing than those of 7 or 8, but are not as good as the best by the sulphocyanide bath.

Scientific American Supplement, No. 586, March 26, 1887 Various

Dissolve about 8 grammes of ammonic thiocyanate (sulphocyanide) crystals in a liter of water, and adjust to decinormal argentic nitrate solution, by diluting till one volume is exactly equal to a volume of the latter.

Scientific American Supplement, No. 611, September 17, 1887 Various

The author uses a galvanic current for reducing silver residues, consisting of sulphocyanide.

Scientific American Supplement, No. 441, June 14, 1884. Various

Frequently the prints appear yellow from formation of the double sulphocyanide of copper, but the color disappears by washing in water.

Photographic Reproduction Processes Peter C. Duchochois

After washing in several changes of water, the proofs may be toned in any toning bath, and then fixed with sulphocyanide of potassium, washing afterwards in the usual manner.

Photographic Reproduction Processes Peter C. Duchochois

As long as FeCl or even Cu2Cl is present, if the print is immersed in the sulphocyanate solution, sulphocyanate of copper is immediately formed on the reduced parts, while on the others the sulphocyanide of copper, formed and dissolved by the sulphocyanide of potassium in excess, becomes decom ‐ posed with water in soluble sulphocyanide of copper and deposited as such on the parts already covered with the salt.

Photographic Reproduction Processes Peter C. Duchochois

On the whole, the bath that has given the best results is one containing, in addition to gold, a small quantity of hypo and a considerable quantity of sulphocyanide of ammonium.

Scientific American Supplement, No. 586, March 26, 1887 Various