How to distinguish gold in the sand, how to distinguish gold from sand gold?

There are several ways to identify ** in the sand:

1.Color: ** is seven green, eight yellow, nine purple and ten red. This means that the gold content of blue-yellow is 70%, that of yellow is 80%, that of purple-yellow is 90%, and that of reddish yellow is almost 100%.

2.Look at the specific gravity: ** is known that the specific gravity of the substance is relatively large compared to other common metals, and its density is grams of cubic centimeters.

3.It can be compared with the hardness, the hardness of red gold is the smallest, the hardness of pure gold is Mohs, you can bite out the marks with your teeth, and you can scratch the lines with a pin; Real gold is not afraid of fire, it is burned in the flame, it is still golden, and other metals are oxidized and discolored when burned; Real gold is also insoluble in a single acid (e.g., hydrochloric acid, sulfuric acid).

ShakinIt is also a kind of **, produced at the bottom of the river or in low-lying areas, mixed with stone and sand, and is washed out later, and the gold content of the two is different:

1. The gold content is different: the gold content of sand gold is low, and the gold content is about 5%, while the ** seen in China is all pure gold.

The gold content is in. 2. Different degrees of softness and hardness: sand gold is hard in texture, China's first.

It's soft.

3. Different colors: The color of sand gold is golden yellow at first glance, and it is whitish when you look closely, and the color is real golden yellow.

1. Identify adulteration:

1. Whether there are white bright spots, cut the gold bars with materials.

or gold jewelry cut with a magnifying glass.

If you look at its section, if you see white bright spots, because ** and iridium cannot be fused together, it means that ** is mixed with iridium.

2. To measure the specific gravity, first measure the weight of a pure gold bar with a balance, then put the gold bar into a measuring cup, and pour water to submerge the gold bar. Then put the gold bar to be tested into the measuring cup, observe whether the scale of the water rises or falls, as long as it changes, it means that the gold bar is not pure gold. However, this method does not apply to gold jewelry, because there is air in it.

3. Real gold is not afraid of fire, put gold bars or gold jewelry on the fire for a while to observe its changes. As iridium binds with oxygen in the air, an oxidation reaction occurs.

Therefore, gold bars of insufficient purity will turn gray; Pure gold, on the other hand, will be red and shiny in color after being roasted by fire. However, this method may be destructive to jewelry.

The differences between Shajin and ** are:

1. The origin is different.

**Includes rock gold and sand gold in the form of underground, and sand gold is produced in riverbed areas. Shajin is under the riverbed, often mixed with stone sand, and washed out to become **.

2. The shape and appearance are different.

Shajin is generally in a granular state, with different sizes, the large ones are the size of broad beans, and the small ones are like fine sand, and the ** is generally a relatively regular shape.

3. The gold content is different.

The gold content of sand gold is equivalent to 95% and 96% of the gold content**.

If you travel to Southeast Asia, especially Vietnam, there is a local ** jewelry that must be cautious when buying. This kind of **jewelry looks very similar to China's**, but ** is much cheaper than the domestic one, many friends feel that they have picked up a big bargain, but if you really buy, to the same goods in China, you may feel how serious a mistake you have made.

And not only Vietnam, there are this kind of ** in many regions, his name is Sha Jin, simply put, it is a ** scooped out of the mud and sand. If you don't look carefully, you can't see the difference between this kind of sand gold and **, and only those who really know how much difference there are between the two. Next, I will tell you about the origin of this sand gold.

The word "sand" in Shajinsha Jinsha illustrates its production method. Sand gold is mined in the low-lying area at the bottom of the river, that is, the gold is first seen after the yellow sand is exhausted. However, although there is a gold character in the sand gold, in fact, the gold content of this gold is relatively low.

Shajin that has not been purified is actually very cheap, because it contains too many impurities. And unpurified sand gold is also called raw gold.

The main difference between Vietnam and China's ** is actually in the gold content. You should have heard of the saying that pure gold means 999 gold, and the content of sand gold in Vietnam can only reach 99 gold. The current ** in the Chinese market is pure gold, and this kind of scarf in Vietnam is also called 24k**.

There is still a certain difference between the two in appearance, for Vietnamese sand gold, if you look carefully, you can find that although Vietnamese sand gold is golden at first glance, but if you look closely, he is a little white.

At the same time, we all know that the texture of ** is relatively soft, that is to say, the higher the content of **, the softer the texture. However, Vietnamese sand gold is relatively hard, and this is because of its relatively low gold content.