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The plate, after being "sensitized" and washed, is plunged in a bath containing ten grains of tannin to an ounce of water. It is then dried, and may be kept for a long time without losing its sensitive quality. It is placed dry in the camera, and developed by wetting it and then pouring over it a mixture of pyrogallic acid and the solution of nitrate of silver.
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.
I considered that he, who would one day have the honor of calling himself Arsene Lupin, ought to be exempt from the ordinary laws governing appearance and identity. Appearance? That can be modified at will. For instance, a hypodermic injection of paraffine will puff up the skin at the desired spot. Pyrogallic acid will change your skin to that of an Indian.
Proceed as follows: Have two porcelain dishes large enough to hold four or six of your plates; into one put sufficient clean water to nearly fill it, into the other put 30 ounces of clear, flat, not acid, bitter beer, in which you have dissolved 30 grains of pyrogallic acid. Pour this through a filter into the dish, and avoid bubbles.
"See those hands?" said the Observer, holding up two "bunches of fives," whose digits were stained near the ends with some dark brown substance, "that's pyrogallic acid and that burn near my thumb was made by Blitz Pulver. It wouldn't take a Sherlock Holmes to discover that I had the camera craze, would it?
I know you don't care to hear from me, but I'll just say that I'm going out to New Zealand. I don't know what I shall do there, but a fellow has asked me to go with him, and it's better than rotting here. It may help me to escape the devil yet; if so, you shall hear. Goodbye!" He thrust the letter back into his pocket. 'I rather thought the end would be pyrogallic acid.
"Then you have no prejudices as to which is the best developer, pyrogallic acid or ferrous oxalate, not to mention such recent decoctions as eikonogen, quinol, and others?" No, the boy had none. "Well, that's what I like. I like a young man whose mind is open to conviction." The boy was not a conversational success. He evidently did not enter into the spirit of the artist's remarks.
For soda developers, Eder uses a solution of 10 parts of pure crystallized soda in 100 parts of water. For use, 100 c.c. of this solution are mixed with 6 c.c. of a pyrogallic solution of 1:10, without the addition of any bromide. More pleasant to work with is Dr. Stolze's potassa developer. No. 1: Water, 200 c.c.; chem. pure potassium carbonate, 90 gr.; sodium sulphite, 25 gr.
The liquid ascended the tubes by capillary attraction and siphoned over the curve, running as he turned the tubes up to the finely pointed ends. Next in a watch glass he placed some caustic soda and in another some pyrogallic acid, from each of which he took just a drop, as he had done before, inclining the tubes to let the fluid gravitate to the throttle end.
For 25 cc. of this gas we found, after absorption by potash 20.6, and after absorption by pyrogallic acid, 17.3. Taking into account the volume which remained free in the flask, which held 315 cc., there was a total absorption of 14.5 cc.
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