Gupoxing Jewelry helps you analyze: the discoloration of gold and thousands of gold jewelry
Gold jewellery is divided into different varieties according to its gold content. China's national standard GB11887 divides gold jewelry into 999 ‰ thousand gold, 990 足 full gold, 916 ‰ 22K gold, 750 ‰ 18K gold, 585 ‰ 14K gold, 375 baht 9K gold. These varieties of gold jewelry can be incorporated with other metal elements besides toxic and harmful elements such as cadmium, lead, mercury and radioactive elements.
For a long time, consumers have always believed that gold and thousands of gold jewellery will never change color. Once the beloved thousand gold and gold jewelry are discolored, it is considered that the amount of jewellery purchased is insufficient, and the business theory or return is to be found. The problem of discoloration of gold and thousands of gold jewellery has made consumers and businesses very hard-working. As everyone knows, the reason for discoloration is very simple, mainly the following:
First, the gold content of gold jewelry is more than 99‰, the content of thousands of gold jewelry is more than 999‰, and its gold content is not 100%. This shows that although their gold content is high, they may be doped with other elements. The presence of red, white, purple, and black spotted color regions on their bodies may be small.
2. When gold is worn together with white jewellery such as white gold or silver, it is very likely that the metal of the white jewellery will be smeared on the gold jewellery or the gold will be smeared on the white jewellery due to the friction between the jewels. The rubbed parts appear only on the surface and are scratch-like.
Third, there is a chemical term called "amalgam", the so-called amalgam is an amalgam. Mercury can form an amalgam with all metals except iron. The whitening of gold also has the reason for the formation of amalgam in the presence of mercury. Mercury is also called mercury. The atomic number is greater than gold by 1 and the color is silver white. The liquid metal is easy to flow. The boiling point is 356.58 ° C. The steam is highly toxic. Thermometers, barometers, and vapor lamps commonly used in daily life are made of mercury, and inferior cosmetics, drugs, fungicides, and the like may also have mercury. If you do not pay attention to contact with gold jewelry, gold amalgam will be formed. Therefore, the surface color of the gold jewelry becomes white, and the sex becomes brittle. If the area is large, it will be broken on the ground.
Fourth, the full gold and thousands of gold jewelry placed in the environment containing S for a long time, the surface may have erythema; when the gold and thousands of gold jewelry and acid contact, there may be erythema. This is due to the oxidation of the internal impurity elements to produce an oxide layer on the surface of the gold jewelry.
When the above situation occurs, don't worry, first consult the relevant experts, find a professional organization for identification; then, according to the specific situation, deal with the expert's suggestion, the problem of discoloration will be solved.
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