1, fire test.
Platinum is hard and resistant to high temperature, so it won't melt in general fire, but will only turn red. If the composition is above 95%, the luster of the color will remain unchanged and will become brighter and brighter; If it becomes a little black, it means that the fineness is about 70%; Fake platinum is all black.
2. Weighing identification and imprint identification
Under the same volume, the weight of platinum is twice that of silver, while the weight of platinum rings of the same style is generally 120% of that of k platinum. In addition, platinum still has its unique imprint pt, silver is s, and platinum usually takes the value with k?
3. Specific gravity
The proportion of platinum is much higher than that of other metals. It is heavier than gold 10% and other metals. We can combine colors and weigh by hand. Platinum is generally the heaviest.
Extended data:
platinum
distinguish
The most common white metals on the market are platinum and platinum, which are easily confused because of their white appearance, but they are actually two completely different metals.
Platinum (Pt for short) is a natural pure white precious metal. Because of its natural pure white color, it can always maintain pure white luster and never fade.
The white color of platinum (commonly known as platinum) is not naturally formed. It is actually an alloy, consisting of 75% gold and other metals, with a white surface. So platinum will fade and yellow when worn for a long time.
The most direct way to identify platinum is to find the unique symbol of platinum in jewelry-Pt or platinum. According to the national regulations, the back of each platinum jewelry must be engraved with the exclusive logo of platinum: Pt or Platinum (Platinum). After the logo, the purity of platinum, that is, the percentage of platinum content, such as Platinum (Platinum) or Pt950, Pt990 and Pt999, the latter two are commonly known as all platinum and thousands of gold.
Just like a platinum ID card. Only jewelry marked with a unique symbol of platinum-Pt or platinum-is a real platinum jewelry. The symbol of platinum is Au750/G750/ 18K/ Au 750, which means that 75% of the alloy material is gold, and the surface is white after adding other metals.
Baidu Encyclopedia-Platinum