Platinum identification method:
Look at the appearance:
Look at this sign. If there is "Pt" on the jewelry or the words "Platnum" or "Plat" are printed, it is platinum; If there is an "s" or "silver", it is silver.
Appearance comparison method. Platinum is gray and hard; And silver is white, delicate and smooth, softer than platinum.
Platinum jewelry is delicate, slightly hard, not easy to wear, light gray in color, elegant in color, bright and lasting in luster, and not black after long use. There are stamps on real platinum jewelry, which is the main symbol. Hot stamping mainly includes the following contents: first, the texture of jewelry, there are two kinds of texture descriptions on platinum jewelry, some are English Pt and some are Chinese "Platinum"; The second is the composition of jewelry. If there is "99" on the platinum jewelry, it means that the platinum content is 99%; Third, the origin of jewelry, jewelry manufacturers everywhere have their own unique seals. These seals, like the trademarks of other industrial products, are essential for the first jewelry, and counterfeiting is absolutely not allowed, because it is not only a symbol of producers, but also a symbol of consumers. It is mainly stainless steel or silver jewelry that is easily confused with real platinum jewelry. Stainless steel jewelry is similar to platinum jewelry in the new era, with gray color and bright luster. However, its white color is gray-black, bright and false, not durable and easy to wear. Silver jewelry is soft and easy to wear; Light in weight, silvery white in color, whiter than platinum, and easy to turn black when used for a long time. In addition, from the seal point of view, stainless steel jewelry has no seal or the seal is vague, and the seal of silver jewelry is different from that of platinum jewelry.
Specific mass (also called the weight of an object):
Weighing method. The specific gravity of platinum iron is 2 1.4, and that of silver is 10.49. Compared with the same volume of materials, the weight of platinum is almost twice that of silver.
Real platinum jewelry is made of metal platinum. Metallic platinum, also known as platinum, has a chemical symbol of Pt, with a specific gravity of 2 1.45 and a Mohs hardness of 4.3. Compared with platinum and gold and silver in the same volume, platinum is the heaviest and hardest. Platinum is a more valuable metal material than gold because of its small natural reserves, difficult mining and stable chemical properties.
Listen to the voice:
Platinum is soft and white, with high color; Hard and brittle, hard to bend and easy to break, dark in color and low in color. Pure white gold jewelry makes a "supporting" sound when it is struck, without rhyme; If the color is not pure, it will make a harsh special sound, with sound and rhyme.
Combustion method. After high temperature firing and cooling, the color of platinum remains unchanged, and it is still gray; Silver becomes moist red or black red. Put the platinum ornaments on the fire, and after the fire test, the color is over 90% and will not change the original color; The fineness turns slightly black at about 70%; Fake ones will turn black and melt easily.
Chemical identification method. Grinding platinum on the touchstone, dropping nitric acid and hydrochloric acid on the touchstone, and if there is a substance, it is platinum; Grind silver on the touchstone, drop a few drops of nitric acid and rinse with water. If this substance disappears, it is silver. Chemical reagents can be tested by adding salt to nitric acid or aqua regia and waiting for a moment. If the fineness is above 95%, it will not change color. The fineness is about 90%, and the color changes slightly; When the fineness is about 70%, the color becomes dark gray.
Platinum common sense discrimination:
According to the national regulations, the back of each platinum jewelry must be engraved with a platinum exclusive logo: platinum (platinum) or Pt. After the logo, there are 1000 points indicating the purity (platinum content) of platinum, such as platinum (platinum)? Or Pt950, Pt990 (foot platinum) and Pt999 (foot platinum). Just like a platinum ID card. Only jewelry marked with platinum or platinum exclusive symbol Pt is a real platinum jewelry.
Pay attention to two points: platinum and platinum are the same metal, platinum is platinum, only platinum can become platinum, white 18K gold is not platinum/platinum, white 18K gold is Au750% gold alloy, and the symbol is au750,750. G 18k .
Platinum, the symbol of platinum is platinum. Without the Pt mark, it is not platinum/platinum.
Platinum card is recognized all over the world: a card marked with the letter platinum is a platinum card.