Gold plating refers to the activity of beautifying objects with a covering or a design of gold which may be in powder form. It is a method of depositing a thin layer of gold onto a surface of another different metal, mostly copper or silver. This is usually done by electrochemical or chemical means

1.Prepare a potassium-iodide solution which will be used to strip gold. Have distilled water, iodine and potassium iodide. Add iodine, potassium iodide and distilled water in the ratio of 1:4:10 in terms of weight. Sodium iodide-iodine solution can also be used as a substitute for the potassium iodide-iodine solution. The main function of iodine is to oxidize the gold plating, while iodide contributes to making the iodized gold soluble.

2.Add the potassium iodide into the distilled water and stir until both are completely dissolved.

3.Add the weighted iodine into the solution. This should be done only after the potassium iodide has been completely dissolved. However, during the addition of iodine, do not stir.

4.Immerse the gold-plated copper into the stripping solution until the gold plating has been removed completely. This should be done at temperatures of between 350 and 400 degrees Celsius.

5.Precipitate the gold that has been dissolved and removed by adding 30 percent hydroxylamine hydrochloride solution. This solution is usually neutralized by use of sodium hydroxide, and it is added up to the point where the solution turns from brown color to clear. Sodium hydroxide is a reducing agent especially in acidic environments. Hydroxylamine hydrochloride solution is usually used as a reducing agent in an alkaline environment to precipitate gold.

6.Add an excess amount of the reducing agent solution to ensure complete removal and precipitation of gold. This should be approximately a third of the initial added amount.

7.Remove the precipitated gold through filtration.

8.Regenerate the hydroxylamine hydrochloride solution by adding 30 percent hydrogen peroxide to every hundred milliliters of the stripping solution. This will assist in restoration of the stripping solution to its former strength.

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National reserve system positive correlation nonferrous metals company.

China Nonferrous Metals Industry Association, third president of the Fourth Conference held in Liaocheng.

Hunan Nonferrous Metals Yuncheng Administration jointly held with entrepreneurs forum.

Differences in the pricing of gold-plated and gold-overlay result from variables related to construction. Strength, quality, and the ratio of gold content are all factors in determining value. For these reasons, gold-overlay products are priced higher than gold-plated. The ability of gold-overlay to withstand frequent use and environmental factors, such as natural skin salt -- which can eat away at the surface of gold-plated products -- results in higher prices, but a less frequent need for replacement.

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While gold-plated and gold-overlay products have similar minimum requirements on karat designation, the difference in methods used to calculate the lowest allowable proportion of gold to base metal contribute to disparities in quality, as well as strength. In determining the amount of gold-based on thickness of coating, gold-plated products often contain less gold than gold-overlay. The lower proportion of gold results in accelerated deterioration, with the gold-plating becoming scratched and worn, cheapening the appearance and undermining quality.

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Owing to different requirements in calculating acceptable thickness of the gold or gold alloy coatings, gold-plated and gold-overlay products vary in the ability to endure the passage of time. The thinness of gold-plating makes it vulnerable to deterioration, due to a susceptibility to friction, which can result in a gradual deterioration of the gold coating. While gold-overlay with a lower gold-to-metal content ratio may also show the signs of wear sooner than those with a higher ratio, manufacturer's labeling of these ratios allows consumers to more easily discern the comparative durability of the product. An overall comparison of durability in gold-plated and gold-overlay indicates added longevity for gold-overlay products, as compared to those designated as gold-plated.

Manufacturers use gold -- a versatile and durable precious metal -- to produce various products, including writing instruments; such as pencils or pens, eyeglass frames, hollow-ware, jewelry and flatware. Gold plated and gold overlay products, which contain both gold and base metals -- such as nickel, copper or zinc -- allow consumers access to products with aesthetic virtues of gold, but without the expense. Despite a common relationship to gold, gold plated and gold overlay differ greatly.

Federal identification standards for gold-plated and gold-overlay products are based on the process and materials used during manufacturing. Gold-plating involves the application of gold alloy or gold to non-precious metals; such as copper, zinc, and nickel, using any suitable plating process to achieve even surface distribution of the gold materials. The gold layer must have a significant overall thickness equaling at least 20 millionths of an inch, which is based on the comparative thickness of half a micron of pure gold. In addition, karat designation must be at least 10 karats. Similarly, the gold alloy for gold-overlays must also be no less than 10 karats, but it is applied to the non-precious metal surface using mechanical plating methods; such as welding, brazing, and soldering. While the U.S. Federal Trade Commission does not define a minimum thickness, the gold alloy must account for no less than one-twentieth of the product's total weight.

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Vermeil (pronounced ver-MAY) is gold-plated silver produced by one of two processes: fire gilding or electrolysis. Fire gilding was banned in the 1800s, since the process produced mercury vapors that caused blindness. Modern vermeil is produced using electrolysis and must meet U.S. Federal Trade Commission regulations (sterling silver coated or plated with a minimum of two and one half microns of not less than 10 karat gold) to be considered genuine. A professional jeweler may use precision sanding, acids and other procedures to remove gold plating. Do-it-yourselfers can use a less-effective home method that employs careful manual cleaning using particular cleansers and refurbishing materials.

1.Use a mild abrasive pad or small natural bristle brush. Briskly rub the piece of jewelry to remove all the gold overlay. If necessary, apply a paste made of baking soda and water to the pad to slightly increase the abrasiveness. Depending upon the ornateness of the jewelry, the process may take a considerable period of time and not be completely successful in removing the gold from all the cracks and crevices.