Silver

21 January 2024, 19:09

Silver is a white metal that practically does not change under the action of oxygen at room temperature, however, due to the presence of hydrogen sulfide in the air, it gradually becomes covered with a dark layer of silver sulfide. Silver is stable in water and does not dissolve in nitric acid or hot concentrated sulfuric acid. With aqua regia, it forms insoluble silver chloride. Like gold, it reacts with alkaline cyanide solutions. The density of silver is 20.20; the melting point is 960 degrees C; its hardness on the Mohs scale is 2.5. Silver polishes well and has high reflectivity; it possesses good malleability and the highest thermal and electrical conductivity among all metals. In order to increase the hardness and strength of silver, it is used in alloys with other metals.

Source: Russian Customs Service dated 20.01.1999 No. 01-15/1361

"ON THE ISSUANCE OF INSTRUCTIONS AND METHODOLOGICAL RECOMMENDATIONS"

(together with "INSTRUCTIONS ON THE PROCEDURE FOR TRANSFERRING, RECEIVING, ACCOUNTING, STORING AND HANDING OVER ITEMS SUBMITTED FOR EXPERTISE TO CUSTOMS LABORATORIES AND CONTAINING PRECIOUS METALS AND PRECIOUS STONES", approved by the Russian Customs Service 11.01.1999 No. 01-23/1359, "METHODICAL RECOMMENDATIONS ON THE PROCEDURE FOR CONDUCTING AN INSPECTION OF JEWELLERY ITEMS CONTAINING PRECIOUS METALS AND STONES WITH THE PARTICIPATION OF A SPECIALIST AND REFLECTING THE RESULTS IN THE PROTOCOL", approved by the Russian Customs Service 11.01.1999 No. 01-23/1360)

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