Silver rain

Silver rain for a turning sun or fire wheel meal powder 16 parts, saltpeter 1, sulfur 1, steel filings 5 parts. 

Silver Rain. Mealed powder, 2 onnees saltpetre, 4 ounces sulphur, 1 ounce steal dust, ounce. 

Cloud Seeding. In 1947, it was demonstrated that silver iodide could initiate ice crystal formation because, in the [ -crystalline form, it is isomorphic with ice crystals. As a result, cloud seeding with silver iodide has been used in weather modifications attempts such as increases and decreases in precipitation (rain or snow) and the dissipation of fog. Optimum conditions for cloud seeding are present when precipitation is possible but the nuclei for the crystalliza tion of water are lacking. 

Other Uses. Photochromic glass contains silver chloride (80) and silver molybdate [13765-74-7] (81) (see Chromogenic materials). An apparatus coated with silver nitrate has been described for the detection of rain or snow (82). Treatment with silver-thiosulfate complex has been reported as dramatically increasing the post-harvest life of cut carnations (83). Silver sulfate has been used in the electrolytic coloring of aluminum (84). Silver sulfate also imparts a yellowish red color to glass bulbs (85). 

Pollution can cause opposite effects in relahon to precipitation. Addition of a few particles that act as ice nuclei can cause ice particles to grow at the expense of supercooled water droplets, producing particles large enough to fall as precipitation. An example of this is commercial cloud seeding with silver iodide particles released from aircraft to induce rain. If too many particles are added, none of them grow sufficiently to cause precipitation. Therefore, the effects of pollution on precipitation are complex. 

A To divert storms, clouds can be seeded with silver iodide crystals to promote "targeted" rain. 

Crystals of silver iodide (Agl), in addition to being useful in photographic processing, are used to seed clouds. The atmospheric conditions (humidity and such) must be right for this to work because the tiny crystals act as nuclei on which moisture can condense with the expectation that the small droplets will become heavy enough to drop to earth—as rain. 

Iodine is also used as a test for starch. When placed on starch (a potato for example), iodine turns the starch a dark blue color. Silver iodide is used in the manufacture of photographic film and paper. It is also used to seed clouds because of its ability to form a large number of crystals that act as nuclei upon which moisture in the clouds condenses, forming raindrops that may result in rain. 

Silver iodide is used in cloud seeding for artificial rain making and in photography. Its colloidal suspension is used as a local antiseptic. 

Some Famous Lead Mines. J.-P. de Toumefort, who visited the Levant in 1700, wrote Siphanto, in days of yore, was famed for its rich Gold and Silver Mines . . . Besides the Mines aforesaid, they have plenty of Lead the Rains make a plain discovery of this, go almost where you will throughout the whole Island. The Oar is greyish, sleek, and yields a Lead like Pewter (210). 

Firing rockets with explosives loaded with silver iodide is in use for promoting rain. Silver iodide dispersed in higher layers of atmosphere by anti-aircraft rounds is in use in the USSR. 

D. A. Davies [7] suggested the use of explosive charges for rain-making. The charges, consisting of 15 g of blackpowder plus 1.5% of silver iodide, are sent by balloon into a cloud, where they are exploded by a time fuse. The particles of silver iodide thus released act as nuclei on which the water vapour in a raincloud coagulates, to fall as rain drops. 

To Fix the Picture.—Wash the plate in rain water, and pour over it a nearly-saturated solution of hyposulphite of soda. This will quickly remove the yellow iodide of silver from tho film. Then wash the plata well under a top, and dry it before the fire. 

Printing "by Development.—Hollingwohth b thin paper is to be preferred to any other. Immerse it in a solution containing Bix grains of Balt and one part of iodide of potassium to the ounce of rain water. When dry, brush oyer, it, precisely as in the ammonio-nitrate process, the following solution of nitrate of silver —... 

The natural wearing down of silver-bearing rocks and soil by the wind and rain also releases large amounts of silver into the environment. 

Silver that is released into the environment may be carried long distances in air and water. Rain washes silver compounds out of many soils so that it eventually moves into the groundwater. Silver is stable and remains in the environment in one form or another until it is taken out again by people. Because silver is an element, it does not break down, but it can change its form by combining with other substances. Over time it may change from the form first released, to metallic silver, and then back to the same or other compounds. The form it is found in depends on environmental conditions. More information on the chemical and physical properties of silver compounds can be found in Chapter 3, on its production, use, and disposal in Chapter 4, and on silver in the environment in Chapters 4 and 5. 

GFAAS technique is more sensitive than FAAS methodology for determination of silver in water samples. Rain and stream water have been analyzed by GFAAS technique to detect silver at ng/mL levels (Rattonetti 1974). 

Silver iodide powder has been used as an antiseptic and as an agent to seed clouds for rain. Silver iodide is 45.9% silver by mass. If you separate a 50-g sample of silver iodide into its elements, silver and iodine, how much silver would you have ... 

Figure 2.2 (a) Absorption and emission processes between states m and n. (b) Seeding of a rain cloud with silver iodide (Agl) to induce a shower of rain... 

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