Gold is so soft that when jewelry is made from it, it is usually alloyed with one or a combination of copper, nickel, and silver. If gold jewelry is immersed in an individual acid, the gold itself will not dissolve, although the alloying metal does dissolve. If a chunk of metal is fake gold--if it consists of a metal sample in which there is very little to no gold--it will dissolve in nitric acid.

Density First
Before treatment with acid, the density of the jewelry should be evaluated. Gold has a density of 19.3 grams per cubic centimeter of metal. Copper and nickel are less dense than that--8.96 and 8.91 respectively. Silver has a density of 10.49. If the density of the jewelry is not appreciably more than 9, the piece is fake. Even if it has a trace of gold in it, perhaps a plated covering, it is less than the 10-Karat designation of the lowest grade of solid gold jewelry.

Pure Gold
Pure gold, called also 24-Karat gold, dissolves in alkali cyanide and in a few other unusual substances. It will not, however, dissolve in individual mineral acids. It does dissolve in certain combination acids, most notably "aqua regia" (a mixture of concentrated hydrochloric and nitric acids). Gold dissolved in aqua regia produces a dark amber-to-orange color.

Gold plated Tungsten Product Manufacturer & Supplier: Chinatungsten Online - http://paper-weight.cn/
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A bucking bar assembly that positions a bucking bar for clamping a first panel and a second panel along a lap joint and upsets a rivet to fasten the first panel to the second panel at the lap joint. The assembly includes a lateral carriage system for moving the bucking bar along a length of the lap joint, and a rotational carriage system for rotating the bucking bar relative to the lateral carriage.

Tungsten Bucking Bar Manufacturer & Supplier: Chinatungsten Online - http://www.buckingbar.cn
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Shoppers who are looking to buy real gold may unfortunately purchase tungsten gold, or fake gold, by accident. Fake tungsten gold bars are cheap substitutes for the real thing.

Background
Tungsten gold is considered the Ancient Metal of Kings. Tungsten is also called “the heavy stone.”

Pricing
While gold is priced in the tens of thousands per pound, tungsten costs less than $100 per pound. Charging the real gold price for tungsten gold leads to a huge profit.

Qualities
Tungsten gold is scratch-resistant and lightweight. Per cubic centimeter, it has a density of 19.25 grams at room temperature. At liquid density, it is 17.6 grams per cubic centimeter.

Determining Type of Gold
It’s difficult for the average person to quickly spot tungsten gold. However, those who are experienced in the gold industry can find ways to determine if the gold is fake or not.

Purity of Other Metals
Silver and platinum tend to be pure, since the materials are often melted down for making cell phones and catalytic converters.

Gold plated Tungsten Product Manufacturer & Supplier: Chinatungsten Online - http://paper-weight.cn/
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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The bucking bar includes an L-shaped bucking die having a wide section and a thin angular section capable of sliding between an obstacle and the shank. The L-shaped bucking bar consists of Tungsten Carbide. The bucking bar also includes a bucking bar arm coupled to the wide section of the L-shaped bucking die for positioning the thin angular section of the bucking die between the obstacle and the shank of the rivet

A metal tool used to flatten the rivet's shank into a driven button during the riveting process. The bucking bar is used as an anvil to react the forces being driven into the rivet with a rivet gun, thus deforming the rivet.

Tungsten Bucking Bar Manufacturer & Supplier: Chinatungsten Online - http://www.buckingbar.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
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