I have known since antiquity silver as decorative metal values it is also used as a currency where several mines in Asia Minor was held before the year 2500 BC solutions. In the Islamic era silver used in making pots of money. And indicates the Peronist in the fourth century AH / tenth the AD to the presence of mixed silver with gold, not mixed with it and it seems that he intended to blend the union between elements of the confusion is the blending which we mean in the present time in chemistry, he says in his book Aljmaher: "In the village of Sinanh near Zruban found sometimes mixed with silver, iron and was not mingled with him flake from the center, is dissolved, found the piece of iron in pure silver metal cut and divided the secret. " On the chemical side, the silver is not hyperactive minerals. Silver does not dissolve in dilute acids, alkalis and in but dissolve in nitric acid or sulfuric acid Center, which does not react with oxygen or water at ordinary temperatures. And attacking both sulfur and sulphide silver, silver may lose its luster because of the silver sulfide on the surface portion of the metal. The bleach that contains a reasonable amount of sulfur as a component of proteins-silver loses its luster very quickly. It also loses its luster small amounts of sulfides that exist naturally in the atmosphere, which is added to the gas used in homes, such as hydrogen sulfide. The black silver sulfide among the most salts insoluble in aqueous solutions, and take advantage of this feature in the separation of silver ions from other positive ions.
