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Updated: June 7, 2025
The lecturer closed his remarks by showing the different molecular states of iodide, bromide, and chloride of silver, as produced by different modes of preparation. The color of the film by transmitted light in every case indicated the effect which was likely to be produced on them, and the photographed spectrum in each of them showed the remarkable differences that were found.
Here, then, we have essentially the same chemical elements that we have seen employed in the daguerreotype, namely, iodine, bromine, and silver; and by their mutual reactions in the last process we have formed the sensitive iodide and bromide of silver. The glass is now placed, still wet, in the camera, and there remains from three seconds to one or two minutes, according to circumstances.
A little free potash should be added to combine with any iodide that may chance to be set free by the chloride of gold. This latter mixture has been sold in our market under the name of "Iodide of Brome." Iodide of Bromine. Experiments with Iodine.
Iodine or Iodide of Potassium demands large draughts of wheat flour or starch in water, and then vinegar and water. The stomach should then be emptied by vomiting with as much tepid water as the stomach can hold. Prussic acid, a violent poison, is sometimes taken by children in eating the pits of stone fruits or bitter almonds which contain it.
Solutions of potassium iodide were frequently used for this purpose, giving a sharp, blue record, but fading away too rapidly.
It is used to dissolve the sensitive salt of silver which remains unchanged during the exposure in the camera. It has the property of readily dissolving the chloride, bromide and iodide of silver. It should be pure and free from sulphuret of sodium; should this last be present, it will cause brown spots of sulphurated silver upon the Daguerreotype impression.
When effusion takes place, it is necessary to puncture the sides with a trochar, and draw away the fluid, giving internally one of the following purges three times a day: rosin, eight ounces; saltpetre, two ounces, mix, and divide into eight powders. Half-drachm doses of the iodide of potash, dissolved in water, to be given three times daily, will be found useful in this disease.
The presence of ozone in any vessel or in the atmosphere, may be detected by a test-paper which has been moistened with a solution composed of 1 part of pure iodide of potassium, 10 parts of starch, and 100 parts of water, boiled together for a few moments. Paper so prepared turns immediately blue when exposed to the action of ozone, the tint being lighter or darker according to the quantity.
It will be recognized by the blue colour which it gives with starch. =Iodide of Potassium.= Colourless, generally opaque, cubic crystals, soluble in less than their weight of cold water. Symptoms. Not an active poison, but even small doses sometimes produce the effects of a common cold, including those symptoms already mentioned as occurring with iodine. Analysis.
Heart tonics and stimulants such as digitalis, strychnine and alcohol should be administered when the pulse beats weaken. To promote absorption of the exudate, iodide of sodium may be given. Mustard paste, or a cantharides blister applied over the region of the heart is useful in easing the pain and overcoming the inflammation.
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