In the jewelry industry, there are many varieties that look very similar. For example, the appearance of platinum and silver jewelry is very similar. The average person can't tell which one is platinum and which one is silver. So how do you distinguish it? Xiaobian teaches you a few tricks today.
First of all, to have a certain understanding of platinum and silver, in order to distinguish; platinum metal in platinum, also known as platinum, chemical symbol Pt, specific gravity of 21.45, Mohs hardness of 4.3. Silver is one of the precious metals, the symbol is Ag, and the English is silver. The relative density is 10.49, the melting point (961 ° C), insoluble in alkali and most organic acids, soluble in nitric acid and hot sulfuric acid, and blackened when combined with sulfur dioxide in air. In the same volume of platinum and silver, platinum is heavier and harder in texture. In terms of value, the price of platinum is dozens of times that of silver. Below we compare platinum and silver.
Method 1: Comparison method
Platinum is gray-white when viewed by the naked eye, with a firm texture and a hardness of 4.3. Silver is visible to the naked eye, the color is white, the texture is fine and smooth, the hardness is lower than that of platinum, and the hardness is 2.7.
Method 2: Distinguish the seal
Because every piece of jewelry has an industry mark, so see Pt, maybe see Ptal that is platinum; if you see S, maybe see Silver, that is silver. For example, S925 stands for 925 silver; in addition, note on the copper-plated silver symbol, which is SF.
Method 3: Weigh the component
This method can be used if the imprint is vague, or the imprint has been cut off, or if there is no imprint. Platinum has a high density and a specific gravity of 21.4 kg/m3. The specific gravity of silver is 10.49 kg/m3. In this way, the same volume of silver is only half of platinum. When you take it in your hand, you know which one is platinum and which one is silver.
Method 4: Humorification
Sometimes when you encounter less material, the weight on your hand is not obvious, and there is no seal, then you have to use this method. Platinum is heated or fired. After cooling, the color is constant; while silver is heated or fired, after cooling, the color is red or black.
Method 5: Chemical Law
Apply mercury to the jewelry. You can't attach the mercury to the platinum, otherwise it is a silver jewelry.
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