With the improvement of the level of economic development, gold and silver jewelry has entered the homes of ordinary people. So, how many people know how to identify the authenticity of gold and silver jewelry? Let's take a look at the China Jewelry Merchants Network Xiaobian.
First, use physical knowledge to measure the density of gold and silver jewelry, and to identify the authenticity of gold and silver jewelry. Methods as below:
1. The jewellery to be measured is thrown into a measuring cylinder containing 200 ml of aqueous solution, and the number of milliliters of the liquid level rising, that is, the volume of the jeweled water is the volume of the jewellery. Here we assume that the jewelry has a volume of V cubic centimeters. (Note 1 ml = 1 cubic centimeter)
2. Weigh the quality of the jewelry to be measured with the balance. Put the jewelry into the left dial of the balance, put the appropriate amount of the yard code on the right side of the balance, adjust the whole travel code to balance the balance. The quality of the jewelry is the number of grams indicated by the code quality plus the travel code. Here we can assume that the quality of the jewelry is M grams.
3. The density of this jewelry is M/V. Calculate the specific value. One cubic centimeter of true gold weighs 19.3 grams, and one cubic centimeter of real silver weighs 10.5 grams. Compare it to know the truth.
Second, use the fire method to identify the authenticity of gold and silver jewelry
1. "True gold is not afraid of fire". Put gold jewelry in the fire and burn it red. After cooling, if the surface of the jewelry is still golden yellow, it is real gold. If it is black, it is fake gold.
2. The silver of the real silver jewelry will not change after the fire, if the color of the silver is low, it will turn black.
Third, use chemical knowledge to identify the authenticity of gold and silver jewelry
1. Gold jewelry, take 1:3 nitric acid on a drop of the object, wait for half a minute, if foaming, wipe with cotton wool or white paper, if it is blue-green, it will be faked by copper or copper alloy; The reaction does not show color. Both toughness and considerable hardness are generally genuine.
2, silver jewelry, still take 1:3 nitric acid on a drop of the object, half a minute later into the light salt water, if there is white turbidity can be regarded as genuine.
Fourth, the jewellery contains a lot of gold, it is necessary to use special tools such as touchstone.
Want to know more about gold encyclopedia knowledge, please pay attention to China Jewelry Merchants Network.
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