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Updated: June 28, 2025
The plate iodized to a dark orange yellow, or tinged slightly with incipient rose color, coated over the accelerator to a deep rose red, then back over iodine one-tenth as long as at first coating, gives a clear, strong, bold, deep impression. I will here state a singular fact, which is not generally known to the operator.
The above is right for half or full size boxes, but half of it would be sufficient for a quarter size box. Coat to the first shade of rose over iodine, change to a deep rosy red over quick, and black about one tenth the first. I would not now recommend the addition of "John Roach's quick," as I believe equally good results can be produced without it.
A solution of sufficient strength can be made by moistening or just covering the iodine with water. Chloride of Iodine as an Accelerator. This is probably one of the best accelerators that can be used for coating the plate for taking views; it works too slow, however, to meet the wants of the operating room, yet its use was formerly, for a long time, adhered to by some of our best professors.
It was cut away the old bandage, pull off the filthy cotton, dab with antiseptics what was beneath, pour iodine or diluted acid upon the bare and shrinking tissues, perhaps do that with the knife or probe which must be done where incipient mortification had set in, clap on fresh cotton, wind a strip of cloth over it, pin it in place and send this man away to be fed providing he could eat; then turn to the next poor wretch.
See, Michelet, see, Brugneau: the dressings have come away. Sergeant, Sergeant, the dressings are loosened." He clapped his hands, possessed by a furtive joy; then he suddenly became conscious, and with a deep furrow between his brows, he began to give orders again. "Not any tincture of iodine to-day, doctor. Take away those forceps, doctor, take them away."
Fresh water, as most people are aware, is composed of two gases oxygen and hydrogen. Sea water is composed of the same gases, with the addition of muriate of soda, magnesia, iron, lime, sulphur, copper, silex, potash, chlorine, iodine, bromine, ammonia, and silver. What a dose! Let bathers think of it next time they swallow a gulp of sea water.
Up they came to his swinging table, where Doc took a probe, poked into the wound, wrapped cotton around the probe, soaked it in iodine, jabbed it in, twisted it around, swabbed it out, dressed it down, slapped the patient on the chest, said "Next," and did it all over again. "Next! You'd think it was a blessed barber's shop," Doc heard one of them say.
Davaine has shown that iodine is a strong bactericide. He experimented with anthrax bacilli in water to which iodine was added, and the bacilli were destroyed. But practically the organisms have to be dealt with in the alkaline contents of the bowel, or in the blood or fluids of the tissues, where iodine cannot remain in the free state.
As regards reflection from plane surfaces, we may employ a looking-glass to reflect the light. Marking any point in the track of the reflected beam, cutting off the light by the dissolved iodine, and placing the pile at the marked point, the needle immediately starts aside, showing that the heat is reflected in the same direction as the light. This is true for every position of the mirror.
Every experienced operator has in a degree become familiar with the mechanical uses of all the agents employed, while I fear but few understand the properties, and laws governing those properties, which are so indispensable to produce an image impressed upon the silver surface. There are three substances which form the bases for producing a Daguerreotype; silver, iodine and bromine.
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