1, weighing method

"inch gold inch gold" is also. But this specific gravity method is the most effective for identifying 24k gold. The specific gravity is similar to that of gold, and the specific gravity is gold-plated or gold-plated. There is something wrong with product identification because the proportion of fake goods is similar to that of real gold.

2. Expansibility

The purer the gold, the better the ductility. If you touch it with pure gold, it must feel very soft. At this time, the color is at least 95%.

3. Melting point method

Commonly known as "real gold is not afraid of fire", "fire sees real gold". Gold has a high melting point. Even at the high temperature of 1000c, pure gold will not melt or fade. It will only begin to melt at 1063c, and the inferior K-gold or gold-plated materials will turn red in the fire, and will usually change color or even turn black after cooling.

Extended data:

The authenticity of the gold in the old temple depends on the mark: domestic gold ornaments are purified and prepared according to international standards, and are marked with seals, such as "24K" for "all red" or "all gold"; 18K gold, marked with the words "18K". If the color is lower than Locke, the K-gold seal number cannot be printed according to regulations.

Nowadays, criminals in the society often make fake brands and imitate stamps, and use rare gold, inferior gold and even brass as real gold. Therefore, the identification of gold ornaments should be based on the comprehensive judgment of samples to determine the authenticity and color.