Commonly used identification methods for platinum

1. Color viewing method: pure platinum is white with brilliant luster, white K gold is white to beige, and silver is pure white. It can be distinguished from the surface color. 2. Hand weighing method: The density of platinum is 21.45. Through the weighing test of the same volume of material, platinum has a heavier feeling. It is heavier than gold (19.36) and more than K platinum. 1. Color viewing method: pure platinum is white with brilliant luster , The color of white k gold is white to beige, and the color of silver is pure white. It can be distinguished from the surface color. 2. Hand weighing method: Platinum has a density of 21.45. Through the weighing test of the same volume of material, platinum has a heavy feeling. It is heavier than gold (19.36), heavier than k platinum, and heavier than silver (10.45). 3. Sintering method: The melting point of platinum reaches 1773oc, which is much higher than k platinum and silver. Generally, the welding gun cannot melt platinum, and the authenticity can be identified based on this. And the color of platinum does not change after cooling. 4. Marking method: Platinum jewelry has standard stamps. Internationally, it is expressed by pt or pt. For example, the fineness of pt950 platinum is 950%. 5. Natural gas method: Put the jewelry on the mouth of the twisted gas stove, and put it on for a few minutes. If the jewelry turns red and heats up and the gas stove is ignited, it is a platinum product. This is because platinum can be used as a catalyst to promote the oxidation of coal gas and the air to exothermic heat, so that platinum can heat up and become red so that it can ignite the gas. 6. Point test method: a. Put mercury on platinum, platinum will not be polluted, while gold and silver will be contaminated by combining with mercury. b. Use a file to file some powder into the hydrogen peroxide bottle on the side or middle depression of platinum jewelry. Platinum can act as a catalyst to promote the decomposition of hydrogen peroxide and release oxygen to churn up and down. Look at the mark to identify platinum. Platinum jewelry usually indicates the texture of the jewelry by the percentage of platinum, and it is also one of the basis for jewelry pricing. Common markings are as follows: Pure platinum: platinum content per thousand is not less than 990, marked with full platinum or pt990. 950 platinum: platinum content per thousand is not less than 950, marked with platinum 950 or pt950. 900 platinum: platinum content per thousand is not less than 900, marked with platinum 900 or pt900. Pure platinum has low hardness. To increase the hardness, a certain proportion of precious metals such as palladium, rhodium and iridium must be added. pt950 contains 5% of palladium, rhodium, and iridium, and the hardness is still relatively low, and is generally used for plain platinum jewelry; pt900 contains 10% of palladium, rhodium, and iridium, and the hardness is just right for inlaid jewelry. At present, most platinum ring settings are made of pt900, but a few manufacturers use pt950 to make ring settings. Since palladium, rhodium, iridium and other metals are rarer and more expensive than platinum, the price of pt900 is correspondingly higher than that of pt950. However, many consumers have formed a habit of understanding gold in the past: the higher the purity of gold, the more valuable it is, and this applies to the relationship between platinum's quality and price. So some merchants take advantage of this and deliberately mark the price of pt950 higher than pt900, misleading consumers to buy, thereby gaining income, inevitably suspected of fraud. The platinum identification method is as follows: First, the purity of platinum jewelry is generally 95%, because platinum has almost no impurities. The platinum mark is pt, and the country stipulates that platinum jewelry with a purity of 85% or more can carry the pt mark. When shopping for platinum jewelry, the easiest way is to recognize the'pt' logo. Only'pt' stands for platinum. Every piece of platinum jewelry, whether it is a ring, a pendant, or an earring, will be engraved with a line of small marks: pt900 or pt950, which means that its platinum content is 95% or 90%. Second, in addition to the'pt' logo, platinum jewelry has an inherent characteristic. Since platinum has the highest density and weight of all white metals, platinum and other white metals of the same volume can be easily judged by just weighing it in your hand. Platinum is heavier than other white metals. Third, platinum has a natural white luster and will never fade. If consumers buy white metal jewelry that will turn gray and dark when left in the air for a long time, it must not be platinum. (Platinum will not turn black) Previous: Seven characteristics of platinum Next: How to distinguish platinum and silver jewelry