Instructions on how to buy gold, distinguish real gold and fake gold

Gold is a precious metal so it has been researched by many scams. Many people have come up with ways to differentiate gold, of course, in a certain way, but we have to use the combination and conditional methods.

How to recognize real gold, fake gold that everyone needs to know

In all the ways to test gold, the most effective tests are often very expensive and complex. We have these tests: chemical composition analysis performed in laboratories of analytical institutes.

Needle

The next way is to process the metal, using a mixture of two hydrochloric acids and nitric acid to turn the gold into a liquid mixture and then precipitate to remove impurities that are used by gold processing people.

Use a spectrophotometer

Based on the lines of the spectrum, we determine the composition of gold.

The above ways give accurate results but only apply to professional establishments. The following ways are for more common users but only according to the circumstances.

Test gold with hydric chlorine acid (included in batteries) or sulffuric acid

Because acid affects most metals, in the case of a piece of metal that is not yellow, it will foam when the acid is absorbed. For doped gold, the surface of the gold piece will float tiny, if you use the magnifying glass, you will see very clearly. And the pure gold surface of the gold piece will not have bubbles or bubbles, (this way is very effective in detecting copper).

Try gold with a good magnet

Real gold will not be attracted by magnets. If sucked, it is gold with iron, or fake gold. However, this is just one way. There are still types of gold doped without magnet attraction.

Observe

Use a magnifying glass to shine gold. Real gold, old enough will have a smooth surface, no tiny dots, no protrusions.

Check in the carvings, carvings

If the mark is still beautiful, the edges of the gold do not change color, then it is real gold. If the markings are green or dark blue: it is padded.

Try to bite gold

This is the test of the ancients. If the gold mark is left after the bite, it is true gold (real gold is very flexible, softer than other metals). If there is no obvious trace, it is fake gold.

Find an unglazed ceramic piece to check

Rub gold onto the ceramic surface. If there is a yellow streak, it means real gold, black streak is fake gold.

Bring fire test

The next way is often said in folk that if it is gold, it must withstand fire . Using a gold-burning burner from 1000 - 1400 degrees of gold will melt like water droplets and will shrink together, some other metals will burn and evaporate, after leaving the gold will return to normal.

Distinguish real and fake gold by relying on weight

How to distinguish real gold, the simplest fake gold is based on weight. The weight of gold is calculated in grams, you can ask the goldsmith to complete the weight of gold. Giving gold to a vial with volume measurements, you can measure the gold's preference based on the measured volume of rounding up to 2 numbers.

Formula to calculate: density = increased volume / volume. Real gold usually has a density of 19g / ml.

For example: Gold weighs 40g, volume is 2ml, using formula to get 40/2 = 20g is equal to the proportion of real gold.

The purity of gold is calculated in g / ml as follows:

1. 22K - 17.7-17.8 g / ml
2. 18K white gold - 14.7-16.9 g / ml
3. 18K gold - 15.2-15.9 g / ml
4. 14K - 12.9-14.6 g / ml

Experimental gold checking

This is the most common way such as holding a light test, seeing with the eyes, especially typing sounds, even biting, many people can conclude quite accurately, because gold has color, weight, softness and the cries are quite distinct.

Particularly for gold bars, users can use bending force, or impact impulse (using wooden or plastic hammer) if it is real gold, the gold piece will be bent evenly and if it is fake gold it will be very hard even if it is suddenly broken .

In addition, someone may invent other methods of gold testing, such as gold rolling machines or portable hardness tester .

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