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Weibo blogger: Quzhi_Kanhai
Introduction:
In recent months, the price of gold has been rising, and the gold market has been extremely hot.
However, in addition to the rich aunts who keep an eye on the gold market, there are also various scammers hiding in the dark.
There was a gold fraud case in Berlin, Germany last year, and the fraudster's tool was "fake gold bars" purchased from China.
Today, Mr. J will tell you how fake gold bars appear to be fake. Only by understanding the fraudsters’ methods can we fundamentally prevent problems before they occur. Please understand this article correctly and do not make fake gold bars.
Due to the U.S. imperialism’s nonsense, the price of gold has skyrocketed recently, rising from 280 three months ago to a maximum of 318 per gram. Gold trading has also become active, and more and more gold jewelry, gold bars, and gold bricks are being tested.
A few days ago, we reported on a gold-coated silver bracelet. The gold bracelet managed to break open, but we basically rejected the gold bricks because we couldn’t do non-destructive testing. The reason will be known below.
Evolved fake gold bars
2 kg fake gold bars required materials:
200~500 grams of gold and 1500~1800 grams of tungsten
Today’s quotation is 310 RMB/g for gold and 0.2 RMB/g for refined tungsten. The material price difference is: 620,000 for 2 kg of gold bars. , 60,000 fake gold bars
Why use so much gold... Because there is a thick layer of gold on the surface, it can pass non-destructive testing and tooth bite testing (tungsten hardness is very high)...
The reason why tungsten is chosen is because the densities of tungsten and gold are almost the same. Exactly the same, the density of tungsten is 19.35g/cm³, and the density of gold is 19.32g/cm³. The specific gravity method is completely invalid, and Archimedes can drown in the bathtub.
In addition, the price of tungsten is very low, and the price of similar metal iridium is much more expensive, which is not cost-effective. Good quality, low price and easy to obtain, tungsten is perfect.
The incorporation method is also advancing with the times, which has a lot to do with the detection methods.
Currently, conventional gold testing adopts non-destructive testing . No one wants to receive gold jewelry or gold bars with signs of damage.
But the biggest limitation of non-destructive identification is that the X-ray fluorescence method can only detect metal about 1mm on the surface. That is to say, if the gold coating exceeds 1mm, this detection method cannot determine what metal is inside.
Therefore, the most accurate detection method is internal sampling, which can be done by drilling holes or cutting into gold bars. The earliest gold-skin-coated tungsten gold bars could deceive specific gravity methods and X-ray non-destructive identification, but internal sampling could not.
As a result, smart scammers came up with new tricks and a new type of fake gold bars appeared. The tungsten mixed into
is no longer in the shape of a plate, but surrounds the gold bricks, leaving the middle part aside, because whether it is sampling or cutting, most operations are between the gold bricks. There are also partially mixed tungsten strips and tungsten mesh, which increases the risk of sampling.
At present, many gold brick sampling tests use the overall melting method, or random vertical and horizontal penetration sampling. The overall melting method is the most accurate, but also the most helpless and troublesome sampling method.
In fact, you don’t need to be too nervous. After all, fake gold bars are not everywhere. Gold bars purchased from banks and medium-sized or larger jewelry stores will be fine. Accidents at banks are basically man-made accidents caused by failure to follow procedures.
The hardest hit area for fake gold bars is mortgages. For example, after paying the deposit, the scammer gives you physical collateral. In particular, MLM groups like to use fake gold bars in order to increase their credibility. With high returns and tons of gold as a guarantee, most people cannot resist its temptation.
As the saying goes, there are no pies falling from the sky, they are all well covers wrapped in the skin of trapped cake .
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