silver iodide
Quick Summary
Silver iodide (AgI) is a chemical compound that darkens when exposed to light. It is used in photography, medicine, and for rainmaking.1
Silver is a lustrous metal valued for its beauty and conductivity. It is located in Group 11 and Period 5 of the periodic table. Silver compounds include silver chloride (AgCl), silver bromide (AgBr), and silver iodide (AgI), all of which are used in photography. Silver iodide also finds application in cloud seeding for artificial rainmaking and as an antiseptic.2
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cloud seedingProcessdioxide (dry ice) and silver iodide have been the most effective; when used in supercooled clouds (that is, those composed of water droplets at temperatures below freezing), they form nuclei around which the water droplets evaporate. The resulting water vapour deposits into ice crystals, which build quickly as water…
Read Moredioxide (dry ice) and silver iodide have been the most effective; when used in supercooled clouds (that is, those composed of water droplets at temperatures below freezing), they form nuclei around which the water droplets evaporate. The resulting water vapour deposits into ice crystals, which build quickly as water…
Read More- weather modificationPrecipitation modification
Since the late 1990s, silver iodide is routinely used to seed winter supercooled clouds over the mountainous western United States in order to increase the snowpack.
Read MoreSince the late 1990s, silver iodide is routinely used to seed winter supercooled clouds over the mountainous western United States in order to increase the snowpack.
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- wet-collodion process
…of silver nitrate to form silver iodide. The plate, still wet, was exposed in the camera. It was then developed by pouring a solution of pyrogallic acid over it and was fixed with a strong solution of sodium thiosulfate, for which potassium cyanide was later substituted. Immediate developing and fixing…
Read More…of silver nitrate to form silver iodide. The plate, still wet, was exposed in the camera. It was then developed by pouring a solution of pyrogallic acid over it and was fixed with a strong solution of sodium thiosulfate, for which potassium cyanide was later substituted. Immediate developing and fixing…
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technology of photographyThe latent imagesilver iodide. Exposure to light in a camera produces an invisible change yielding a latent image, distinguishable from unexposed silver halide only by its ability to be reduced to metallic silver by certain developing agents.
Read Moresilver iodide. Exposure to light in a camera produces an invisible change yielding a latent image, distinguishable from unexposed silver halide only by its ability to be reduced to metallic silver by certain developing agents.
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