Sterlin silver findings4/2/2023 ![]() However, if a quality mark is used, the mark must be accompanied by a manufacturer's hallmark that is a registered trademark or the name of the manufacturer. In the USA, The National Gold and Silver Marketing Act does not require precious metals to be marked with quality. When testing suspect goods, a small file can be used to cut through any plating or lacquer in a discreet area on the item. Silver-plated brass, nickel silver or low quality silver alloys will turn green when a drop of nitric acid is applied, because of the high copper content. Some countries require jewelry made of precious metal be submitted to a governmental assay office for destructive testing before being marked and sold. In many countries, precious metal must be stamped with a quality mark such as "925" for sterling. "German Silver," "Alpacca," and "Alpaca" are merely other names for the alloy of copper, nickel and zinc usually called " nickel silver." Despite the name, nickel silver contains no silver. "Mexican Silver," "German Silver," "Indian Silver," "Montana Silver" and simply "silver" do not guarantee any silver content. "Coin" silver is used in some countries and could be marked "900" or "800" depending on fineness. Sterling components and jewelry made in the USA are often stamped "sterling." Goods made for international trade are often marked "925" indicating the 92.5% fineness. Fine silver can be fused! (Sterling silver requires solder fine silver can be joined with just heat, no solder required.)
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