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Topic: Silver sulfide

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Silver Whiskers

Silver

Hydrogen sulfide

Sterling silver

Lead sulfate

Silane

Potassium carbonate

Sodium nitrate

Silver nitrate

Calcium carbonate

Inorganic table information

Nitrogen dioxide

Nitric acid

Potassium hydroxide

Potassium nitrate

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	Silver Conservation
		Silver is a very noble metal and is often found in a native state combined with gold, tin, copper, and platinum.
		Silver is particularly susceptible to the effects of the sulfide radical.
		During electrolysis, the reduced silver corrosion layers regenerated on the surface of the metal in formic acid are left in granular or particulated layers, which are physically weak and tend to separate from the metallic core.
	nautarch.tamu.edu /class/anth605/File13.htm (4021 words)

	silver on Encyclopedia.com (Site not responding. Last check: 2007-10-21)
		Silver is almost always monovalent in its compounds, but an oxide, a fluoride, and a sulfide of divalent silver are known.
		Silver chloride, bromide, and iodide are used in still photography because of their sensitivity to light.
		Silver was one of the first metals to be used by humans (see silverwork).
	www.encyclopedia.com /html/s1/silver.asp (1105 words)

	Method for recovering silver from waste solutions containing thiosulfate compounds - Patent 4755453
		During the processing of x-ray film, the silver halide emulsion is exposed to radiation or light causing the reduction of a small fraction of silver halide to silver metal thereby forming a latent image of the subject.
		It was found that the iron in the bleach solution did not affect the silver precipitate and did not precipitate with the silver, so that the residue consisted of sulfur and silver sulfide which leads to the economic removal of the silver from the residue.
		The extraction of silver from the treatment solution by nitric acid precipitation of silver sulfide is insignificantly affected by the strength of nitric acid used.
	www.freepatentsonline.com /4755453.html (4298 words)

	Organophosphine sulfides as photographic sensitizers - Patent 4115129
		The organophosphine sulfides may be added at any stage of the preparation of the silver halide emulsions prior to digestion, e.g., during precipitation of the silver halides, or after the washing and redispersion stage, or during digestion.
		The organophosphine sulfide compounds were added to silver halide emulsions during the precipitation of the silver halides, during the redispersion after washing the emulsions to remove unwanted water-soluble salts resulting from the precipitation of the silver halides, or during the digestion period.
		Silver chlorobromide emulsions were made according to Procedure A and remelted according to Procedure D except that the sulfur sensitizer was omitted in one control emulsion and included in a second control emulsion.
	www.freepatentsonline.com /4115129.html (4100 words)

	Tarnish Removal from Silver
		Silver tarnishes because it undergoes a chemical reaction with sulfur-containing substances in the air.
		Silver combines with sulfur to form silver sulfide, which is fl, and darkens the silver.
		Two ways to remove the silver sulfide are to: remove it from the surface, or reverse the chemical reaction and turn silver sulfide back into silver.
	educ.queensu.ca /~science/main/concept/chem/c03/C03DEEA1.htm (960 words)

	Toning prints for image protection (Site not responding. Last check: 2007-10-21)
		Metallic silver forming the image in b&w prints is far from inert, and it undergoes chemical interactions with environmental pollutants not to mention moisture and air.
		One of the leading threat to the silver is the oxidative agents contained in the environment, which can cause a variety of change to the image, such as discoloration, fading, mirroring, etc. Peroxide is one such oxidizing agent most commonly encountered in film and print storage environments.
		This stabilizer protects silver image which is vulnerable to strong oxidizing reagents and environmental pollutants, such as ones from automobile exhaust fumes, present in the air.
	silvergrain.org /Photo-Tech/toners.html (4533 words)

	Electrochemistry Encyclopedia --- Extracting metals from sulfide ores
		The underlying sulfide zone, which comprised the bulk of the resource, was less amenable to treatment in the smelters of that era, and a method was required to recover the metal values if the potentiality of the primary ore was to be realized.
		The interaction of the organic collector with the sulfide mineral surface occurs by a corrosion-type mechanism in which an anodic oxidation reaction attaches the organic collector to the mineral surface and the electrons transferred to the mineral by this reaction are returned to the solution phase by the reduction of oxygen.
		Silver, gold and platinum group metals present in copper ores follow the copper in both the flotation circuit and the smelter, and are recovered in the final, electrorefining stage.
	electrochem.cwru.edu /ed/encycl/art-m02-metals.htm (5694 words)

	HYDROGEN SULFIDE IN WORKPLACE ATMOSPHERES - (Inorganic Method #141)
		A calibrated personal sampling pump is used to draw air through a filter impregnated with silver nitrate which converts the hydrogen sulfide to silver sulfide.
		The sulfide was precipitated as cadmium sulfide (CdS) and subsequently analyzed by the methylene blue calorimetric procedure (8.1.
		The silver sulfide is dissolved in an alkaline cyanide solution and analyzed for sulfide by DPP using a dropping mercury electrode (DME).
	www.osha.gov /dts/sltc/methods/inorganic/id141/id141.html (3283 words)

	Nano bridge builds logic 012605
		The researchers made the switch by depositing a 1-nanometer thick layer of silver on a silver sulfide-coated silver wire, positioning a platinum wire on the silver layer, and applying a negative voltage.
		The voltage caused the atoms in the silver layer to be incorporated into the silver sulfide coating, leaving a one-nanometer gap between the silver sulfide and platinum wires.
		A positive voltage turns the switch on because it draws enough silver atoms to the surface of the silver sulfide to bridge the gap between the two wires.
	trnmag.com /Stories/2005/012605/Nano_bridge_builds_logic_012605.html (756 words)

	Cleaning SILVER WITHOUT losing the Ag!
		The silver can be returned to its former luster by removing the silver sulfide coating from the surface.
		In the reaction, sulfur atoms are transferred from silver to aluminum, freeing the silver metal and forming aluminum sulfide.
		The aluminum sulfide may adhere to the aluminum foil, or it may form tiny, pale yellow flakes in the bottom of the pan.
	www.darylscience.com /Demos/Silver.html (1152 words)

	[No title]
		the concentrations of silver ion, bromide ion and silver bromide to increase.
		the concentration of bromide ion to increase and the concentration of silver ion to decrease.
		the silver ion concentration to increase and the sulfate ion concentration to decrease.
	www.chem.purdue.edu /gchelp/116exams/sole.html (2288 words)

	ArtLex on Silver
		Silver reacts with hydrogen sulfide in air to form silver sulfide -- tarnish.
		Silver may be cast, embossed, inlaid, or worked as wire, sheet, foil, or leaf.
		Sterling silver is an alloy containing 92.5% silver and 7.5% copper, it is harder and more workable than pure silver.
	www.artlex.com /ArtLex/s/silver.html (631 words)

	Alan Guisewite's Mineral Collection Images: Miscellaneous Systematic Sulfides Page
		Berthierite's another iron antimony sulfide - this miniature of a massively parallel bundle of fibers is from the Herja Mine, Baia Mare, Maramures County, Romania.
		One of the two "ruby-silver" ores (the other is proustite), pyrargyrite (a silver antimony sulfide) is a marker for silver and is often used as a silver ore (60% silver).
		Siegenite's a rare nickel cobalt sulfide - this large thumbnail (with a dolomite matrix) is from the Sweetwater Mine, Reynolds County, Missouri.
	www-2.cs.cmu.edu /~adg/adg-pssuiimages.html (5680 words)

	How To Clean Silver (Site not responding. Last check: 2007-10-21)
		Silver tarnish, however, is the formation of fl silver sulfide on the surface of the metal.
		This tarnish is caused by sulphur and sulfides which attack the surface of the silver.
		The fl silver sulfide (Ag2S) is among the most insoluble salts in aqueous solution, a property that is exploited for separating silver ions from other positive ions.
	www.easterncreations.com /easterncreations/howtoclsi.html (508 words)

	079 Potentiometry During Silver One Pot Reactions (Site not responding. Last check: 2007-10-21)
		Recover silver from the solid by treating with concentrated nitric acid under a hood to dissolve the silver sulfide and oxidize the sulfide ion.
		Silver foil would be a satisfactory substitute, but the recovery of the foil and the shining of the foil surface after use are questionable.
		A similar pattern is involved for the silver ammine complex where a substantial excess of ammonia is required to drive the reaction and the reactions takes considerable time to achieve.
	www.cci.unl.edu /chemistry/smallscale/SS079c.html (2722 words)

	Remove Tarnish from Silver
		If you have any objects made from silver or plated with silver, you know that the bright, shiny surface of silver gradually darkens and becomes less shiny.
		This happens because silver undergoes a chemical reaction with sulfur-containing substances in the air.
		If the silver is badly tarnished, you may need to reheat the baking soda and water mixture, and give the silver several treatments to remove all of the tarnish.
	scifun.chem.wisc.edu /HOMEEXPTS/TARNISH.html (626 words)

	Cleaning tarnish off of silver(Larry Lippman, Barry Ornitz)
		To correct a few things: all "thio" compounds are sulfur containing (not mercury), silver oxide is not more conductive than metallic silver but it is more conductive than silver sulfide (fl tarnish), The simplest process for cleaning silver of tarnish is described below.
		The only problem is that the silver or silver plated part must be immersed in an aqueous solution.
		The silver sulfide is reduced to metallic silver with the sulfur ions going into solution.
	yarchive.net /chem/silver_tarnish.html (835 words)

	Autometallographic Silver Enhancement of Zinc Sulfide Crystals Created in Cryostat Sections from Human Brain Biopsies: ...
		Danscher G, Howell G, Pérez-Clausell J, Hertel N (1985) The dithizone, Timm's sulphide silver and the selenium methods demonstrate a chelatable pool of zinc in CNS.
		Danscher G, Montagnese C (1994) Autometallographic localization of synaptic vesicular zinc and lysosomal gold, silver and mercury.
		Danscher G, Zimmer J (1978) An improved Timm sulphide silver method for light and electron microscopic localization of heavy metals in biological tissues.
	www.jhc.org /cgi/content/full/45/11/1503 (4178 words)

	One Pot Silver Reactions (Site not responding. Last check: 2007-10-21)
		The silver in the water solution exists as an aquo complex, Ag (aq), which is represented simply as Ag Addition of a carbonate source leads to the formation of silver carbonate.
		Finally, addition of a sulfide source allows the formation of silver sulfide, which supports the lowest concentration of silver ion of any of the complexes or solids formed in this reaction sequence.
		In photography, the unexposed, unreduced, insoluble silver halide is removed from the emulsion after development using sodium thiosulfate.
	dwb.unl.edu /chemistry/DoChem/DoChem109.html (954 words)

	Thermo Electron Corporation - - Sulfide Electrode Bibliography
		"Determination of sulfide in blood with an ion-selective electrode by preconcentration of trapped sulfide in sodium hydroxide solution." Lindell, Henry; Jappinen, Paavo; Savolainen, Heikki (Res.
		"Determination of silver in alloys by potentiometric titration using the Gay-Lussac principle." Debreczeni, Jozsef (Nemesfemvizsgalo Hitelesito Intez., Budapest, 1082, Hung.).
		"Sulfide ion-selective electrode as potentiometric sensor for lead(II) ion in aqueous and nonaqueous medium." Radic, N.; Milisic, M. (Fac.
	www.thermo.com /com/cda/resources/resources_detail/1,2166,10478,00.html (1106 words)

	Pointers about disposal of chems into septic system (or not at all)? (Site not responding. Last check: 2007-10-21)
		Kodak states =that some spent fix in the sewage is OK because the silver is soon the =sulfide.
		But sulfides can be oxidized to the =sulfate and silver sulfate is slightly soluable.
		As we all know the sulfide of silver is the silver to have in a print for extreme print longevity.
	www.urban-living.org /new-3697728-674.html (3551 words)

	Cleaning the Silver (Site not responding. Last check: 2007-10-21)
		The tarnish is a chemical change which takes place when sulfur compounds in the air combine with the silver to make silver sulfide.
		This is especially serious for silver plated items, as years of polishing will wear away the silver, revealing the metal underneath.
		The sulfur from the silver sulfide (Its formula is Ag2S) is moving to join with the aluminum to form aluminum sulfide (Al2S3).
	www.edgerton.org /kidscorner/silver.html (434 words)

	063 One Pot Silver Reactions
		Write the formula of the silver ion or compound which contains most of the silver which was added.
		Because the manipulation of silver halides is a part of common photographic processes, a phenomenological version of the activity works in applied chemistry classes.
		This is accomplished by a concentration effect; the ammonia is kept at a high concentration relative to the chloride ion.
	chemmovies.unl.edu /chemistry/smallscale/SS063c.html (1051 words)

	silver
		Silver chloride, bromide, and iodide are used in still
		Silver was one of the first metals to be used by humans (see
		Silver Wheaton Reports Record Second Quarter Net Earnings of US$6.7 Million.
	www.infoplease.com /ce6/sci/A0845253.html (479 words)

	Opaque Minerals
		Source of arsenic, source of gold, silver, tin, cobalt as by-products
		Source of copper; source of gold and silver as by-products
		Extraction of gold and silver formerly, electrotechnology, fungicides formerly
	www.innvista.com /science/earth/geology/opaque.htm (127 words)

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