Gold will rust: revealing fake fakes

I have already talked with you about the problem of whether gold will rust in the early stage. Today, I will talk about the issue of gold fraud.

Investment trap

It is gold, it always shines, is it still "rusting"?

The Spring Festival is near, it is the peak period of hot selling of gold products, but in recent days, the rusting and long spots of gold products, fraudulent clouds and other issues have made buyers worried. In this regard, Yang Yan, director of the Guangdong Gold and Silver Jewelry Testing Center, told the Southern Reporter that the reason for the rust of gold is mostly left over from the processing technology, and it cannot be simply equated with the lack of color.

For the gold fraud that investors care about, the Guangdong Gold Association industry insiders said that the market mainly has four methods: gold plating, gold, gold and tungsten. The latter kinds of fraud are not easy to distinguish, investors through formal channels. Buying gold is the most insurance.

[risk warning]

It is difficult to identify the gold

Before the "rusting" of gold was raging, there was a rumor that "40% of the gold bars in the Chinese market were mixed with sputum or tungsten." The rumors also caused a sensation. Whether gold is fraudulent or not is also concerned by many people.

Is there any case of adulteration in gold? What are the common ways of fraud?

"Of course there is adulteration, especially in Shenzhen in the early years, it is the largest gold distribution center in China. There have been some unscrupulous merchants selling platinum in platinum and gold, especially in the platinum group, the latter one gram. Dozens of pieces, platinum is similar to the price of gold, illegally gaining profits." An industry insider who has worked in the gold processing business told the Southern Reporter that until the government made new regulations and vigorously rectified in the past few years, gold production gradually transitioned to formality. He said that gold falsification techniques have experienced gold plating, gold, gold beads, and now add trace elements such as tungsten and antimony. In particular, the two elements, gold and rhodium, are difficult to distinguish by ordinary testing instruments, so as to remove gold.

Gold plating mainly appears on gold products such as modeling ornaments. The illegal elements use copper and lead alloys as linings, and the surface is brushed with gold powder. As long as the blade is gently scraped several times, it is easier to see the impersonation inside, which is relatively easy to identify.

In addition, the gold-clad technique is also one of the frauds, and it is the "Li Gui" package "Li Gui". Take gold bars as an example. Its appearance is half full of gold, but the other half of the inner package is not enough color. Although both are gold, the difference in color is large, and it is difficult for ordinary people to distinguish between true and false. When investors take out, many of them are under the detection of professional instruments, and "Li Gui" can show their original shape, but this will undoubtedly reduce the value of gold bars investment.

The third method is the "golden pearl" fraud. The deceived are mainly merchants, pawn shops and so on.

"We have encountered many cases of this kind of deception." Yang Yan said, for example, someone bought a gold necklace in the formal shopping mall in the morning, and in the afternoon he asked for a replacement because he did not like it. According to the regulations of the mall, it can be returned free of charge. The counter then returned another equivalent gold necklace. However, in the later inspections, the merchant found that the gold necklace returned was actually a fake gold necklace that was faked by the “golden package”. Originally, the outside of the fake gold necklace was gold, and the small gold beads were used. The gold beads were hollow. The counterfeiters used thick metal such as silver to thicken the inner wall to achieve the weight of pure gold. “Unfamiliar salespersons can easily accept returned fake gold necklaces. If they are not discovered in time, consumers may also purchase such fakes.”

At present, the gold fraud of adding metals such as tungsten and antimony is also common.

Some insiders revealed to the Southern Reporter that the texture of tungsten is relatively hard, with a density of 19.35, which is very close to the density of gold of 19.32. It is suitable for hard gold, especially for modeling and decoration. For example, the same gold bowl, if the pure gold feels softer, but the addition of tungsten makes the bowl harder and longer lasting. Although it is slightly different from real gold in terms of color, ordinary buyers are still difficult to distinguish without professional testing.

Use copper alloy to gain weight

The regular shopping malls have high gold prices, so some people choose to buy gold from small street shops with cheap prices. But there are also some things to watch out for.

“In a small workshop, it is possible to process 20 grams of gold into 25 grams. The gold store can help you to participate in other metals such as bismuth and tungsten in gold.” Wang Chaoyu, director of the Southern Coin Trading Consignment Center, told the Southern Reporter. Small workshops use gold bars to create jewelry. Goldsmiths can add copper alloys, tungsten and other metals to the small buttons and joints of jewelry to increase the weight. It is also possible to sell jewelry in this way. Generally, 20 grams of jewelry can be added. It weighs 3-5 grams, and now the price of gold is high, so it is easy to earn thousands of dollars. "We encountered it when we recycled. Some people bought a gold chain weighing 20 grams in a small workshop. The last one was only a few fake gold." He said that customers generally do not have gold. The destructive inspection of valuables such as the instrument has become a shadow point for some small workshops to be undetected.

[fact]

"rust" stems from process and quality control

According to a person from the Guangdong Gold Association, the higher the purity of gold, the more likely it is. "In terms of gold coins, we have a joke in the industry. 'Rusty' is the anti-counterfeiting sign of China Gold Co., Ltd." He told the Southern Reporter, such as 18K gold, its purity is not high enough, gold and other metal elements It is good, and sometimes it is not easy to rust even if there are impurities such as iron remaining on the surface.

Yang Yan, director of the Guangdong Gold and Silver Jewelry Testing Center, has also been exposed to similar cases of gold “rusting”. She believes that “in most cases, gold rust is not caused by insufficient color. Rusty is generally characterized by brownish spots. Mainly due to the legacy of the processing technology."

She analyzed that gold products are mostly made by hydraulic method or electroforming process. Gold is not cleaned during production and processing. For example, dust and other substances are brought into the process of pressing gold bars, which are stored for a period of time, and are exposed to light, air, etc. Oxidation forms rust spots. "This kind of spot is easily removed by professional cleaning." In addition, the process of producing gold bars is formed by the use of pig iron. If the hammer is used for a long time without timely dusting and scrubbing, it may be possible during the beating process. Bringing impurities into it can also make the gold bars "rust".

In addition to the production process may cause gold "rust", the box of gold bars and coins is another "culprit" that is not very noticeable. According to the introduction of the above-mentioned gold association, the boxes containing gold bars, gold coins, etc. are generally used in the processing process to make sticky glues such as Tianna Shui. If the medicinal ingredients have not evaporated, they are used to hold gold bars. It will induce some mildew production, but these do not mean that the purity of gold is not enough. Even if it is sent for inspection, it will be enough to find the color.

Of course, in addition to rusting erythema, gold jewelry is also prone to white spots. Yang Yan pointed out that this is because gold jewelry and cosmetics, perspiration, and mercury in the laundry liquid combine to form a mercury-gold compound, as long as the gold shop is treated at a high temperature.

[doubt]

Gold will rust?

Recently, a customer in Beijing spent nearly 15,000 yuan, 50 grams of 9999 yuan gold bought in China's gold counter two years ago, I did not expect it to have rust and erythema. The matter has been raging on the Internet.

Such high-purity gold products, and from the famous enterprises, why rust? The netizen's general view is that the purity is not enough and the color is insufficient, which leads to the rust of gold, which has caused many consumers to panic and doubt when buying gold products.

However, this is not surprising in the eyes of the industry.

"Gold rust and spots are not new, but many people still have misunderstandings about this phenomenon." A person from the Guangdong Gold Association who asked not to be named told Nandu that the main gold in the market is mainly It is 2 9, 9 9 and 4 pure 9 with higher purity. They are all increasing in order to approach the limit of gold purity. There is no absolute pure gold. Basically, it is allowed to contain impurities such as lead, iron, titanium and potassium. It's just a very small amount, about 10,000 points, which is negligible. When the gold bar is touched by hand and encounters moist air, if it contains iron, a certain chemical action of the impurities will produce erythema, but this does not affect the quality of the gold.

I believe that the above content can make everyone know more about gold.

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