If the authenticity of the purchased jewelry made of platinum is in doubt or you want to distinguish platinum from several options like metal, try these tips.
Take a common medical iodine and drip on the test item. If a single drop of dark — so, before you do the precious metal. Note, however, that the darker the stain, the higher the fineness of the product.
If you have access to concentrated nitric and hydrochloric acids, as well as experience in dealing with them, make so-called "Aqua Regia". To do this is to mix acid in the ratio 1: 3 (nitric and hydrochloric).
Place the product into solution. Platinum will dissolve in hot water. In the cold it will not happen. Naturally, the fake platinum will immediately begin to dissolve in the cold mixture.
If you have glass-blowing burner, you can try to heat the product. If the metal is incandescent, but has not started to melt, it is likely to you is platinum. Although it is worth considering that palladium and iridium can act in a similar way. However, palladium will dissolve in nitric acid, and platinum — no.
Check for the presence of oxides on the product. Noble metals do not oxidize. Aluminium, for example, when contact with air is covered with an oxide film (passivated), which prevents its further destruction. Platinum is not threatened
If it is possible to violate the integrity of the experimental sample, then try to use it as solder. Uniform distribution of the metal tip of the iron is also indicative of the noble origin of the product.
Also you can check the metal with ammonia. When interacting with platinum, ammonia doesn't cause any darkening that happens in the interaction with other metals.
Advice 2 : How to distinguish platinum
Platinum takes a leading place among the noble metals, along with gold and silver. This beautiful white-silvery metal is quite rare and has properties that make it ideal for manufacture of fine jewelry. An inexperienced person can be difficult to distinguish platinum from other metals, for example, from white gold.
To distinguish the product made of platinum, from jewelry made of white gold, you should know that platinum is a natural white metal, and gold to obtain a white color add some impurities (for example, rhodium plated). The coating can wear off, and the product at the same time acquire dull yellow color.
To distinguish between platinum and white gold, compare weight products. Engagement ring made of platinum will be much heavier than the same ring made of white gold.
Consider carefully test the mark located on the jewelry. For different metals use different form of trial and the stigma of possible values of the sample. So, gold may take one of the following samples: 999, 958, 750, 585, 500, 375. For platinum on the test mark is provided with numerals indicating the fineness: 950, 900, 850.
Pay attention to the strength of metal you have before you, and its resistance to wear. During the processing any metal wears out, however, platinum remains unchanged and timeless, while products made from white or yellow gold may require repair and replacement of worn-out parts with new metal.