Platinum

The most attractive aspect of platinum is its durability. Every time other types of metals are scratched or corroded, a small amount of metal is consumed. In fact, it is precisely because platinum and gold can wear out, so they need to be alloyed with other metals to be worn safely. But this is not the case with platinum. A look may be in the platinum ring catalogue • Platinum • Platinum maintenance • Platinum's physical and chemical properties • Platinum and its jewelry The most attractive part of platinum is its durability. Every time other types of metals are scratched or corroded, a small amount of metal is consumed. In fact, it is precisely because platinum and gold can wear out, so they need to be alloyed with other metals to be worn safely. This is not the case with platinum. A scratch may leave marks on it, but this metal is so hard that it will not be chipped or cracked. We often use platinum, which is both safe and strong, to rim unbound diamonds. Although platinum is the hardest metal among the precious metals, it can still be carved and gradually shows an antique patina color. Many people prefer the unique appearance of platinum. If you like this kind of luster, the jeweler can polish your jewelry to give the original luster. At the same time, rubbing with a soft cloth can make your jewelry look new. The platinum content of most platinum jewellery is 95% (referred to as pt950), mixed with 5% iridium or palladium. For the quality assurance of platinum, please look for the words 950pt or pt on it. There are also some platinum jewelry with a platinum content of 90% (referred to as pt900), mixed with 10% iridium or palladium. For the maintenance of platinum, please use warm water and appropriate soap and a soft brush to gently scrub the platinum, so as to make your platinum jewelry glow with its former glory. Reminder: The cold white brilliance of platinum increases the brilliance of gems, and the hardness of platinum makes the setting of gems firmer. Platinum jewelry Our platinum jewelry is both beautiful and durable. If you appreciate our platinum jewelry with 95% platinum (abbreviated as pt950), do you feel its charm? The physical and chemical properties of platinum The platinum group metal has a beautiful color; it has strong ductility; it is resistant to melting, friction and corrosion; it is chemically stable at high temperatures. Therefore, they have a wide range of uses. Among platinum group metals, platinum is the most familiar and used one. It is rarer and more precious than gold and silver in precious metals. Pure platinum is silvery white; with metallic luster. The color and luster of platinum are natural and unchanged over time. The hardness is 4 to 4.5 degrees. The relative density is 21.45 and the specific gravity is 15-19 or 21.4. Strong ductility, can be drawn into very thin platinum wire, rolled into extremely thin platinum foil; strength and toughness are also much higher than other precious metals. Even if 1 gram of platinum is drawn into a 1.6-kilometer-long filament, it will not break. The melting point is as high as 1173.5°C. Good thermal and electrical conductivity. The chemical properties are extremely stable, insoluble in strong acids and alkalis, and will not oxidize in the air. Platinum does not absorb mercury and has a unique catalytic effect. Identification of platinum and its accessories 1. Simple identification method 1. Color Platinum is silvery white or off-white, which is between the colors of silver and nickel. Silver has white luster and is easily oxidized with black spots or black; its texture is fine and smooth; its hardness is lower than that of platinum. 2. Specific gravity Platinum has a high specific gravity, ranging from 15 to 19 or 21.4. The proportion of silver is 10.49. You can find the difference between platinum and silver jewelry of the same size by hand. 3. The color of pure platinum will not change after being heated or cooled by fire. After the silver is burned, its surface will show a moisturizing or black-red hue. 4. Bending pure platinum is easy to bend and break straight to restore; lower color is hard and brittle, and it is difficult to bend. 5. When listening to percussion, if you make a'toto' sound without rhyme, it is pure platinum; if you make a sharp sound of'ding-ding', with a sound and rhyme, it is platinum with a lower color. 6. The mercury wiping test makes use of the non-mercury-absorbing properties of platinum, and coats mercury on the touchstone grinding track. If it absorbs mercury, it is k platinum prepared with gold, silver and platinum. 7. Nitric acid salt test: Grind the platinum jewelry to be identified on the touchstone, and cover the grinding channel with a layer of salt without covering it; then, drip nitric acid on the salt until it is soaked; then add some heat to the salt. Paper soot plays a catalytic role. After 20 minutes, rinse the salt and nitric acid with clean water. After doing it, look sideways. If there is no change, the color is about 99%; if there is a slight acid mark, the color is about 95%; if the trace of nitric acid is large, the color is about 80-90%; if the grinding track is corroded Layer, the trace turns gray, the color is about 70%; if all the traces disappear, it is fake platinum. 8. Appraisal of spontaneous combustion of gas lamp Put the platinum jewelry to be appraised on the gas lamp port. If it is true platinum, after a minute or two, the jewelry will turn red and the gas lamp will automatically ignite. If the jewelry is not platinum, there is no such reaction. 9. Platinum in the hydrogen peroxide reaction method is a good catalyst and has a unique catalytic effect. Using this feature, platinum can be quickly identified. Commonly used hydrogen peroxide reaction method. The specific method is: take a small amount of powder to be tested and place it in a plastic bottle containing hydrogen peroxide (h2o2). If it is platinum, the hydrogen peroxide will immediately roll and bubble, decompose a large amount of oxygen, and the platinum remains intact after the reaction. Recycling (it only has the effect of accelerating decomposition); if it is pseudo platinum or other white metals, such as lead, silver, aluminum, etc., there will be no such reaction. 10. Others can also ask the geology department for electronic probe testing. Previous: Manual processing of platinum jewelry and precautions Next: Whether the color gold and platinum jewelry have value preservation