What is the reaction of fake gold in salt water?

False gold imitation materials are generally copper or iron.
The salt is added in a glass of water, and its main ingredient is sodium chloride (NaCl).
Copper: There is no reaction to soak in salt water for a short time. The chemical properties of copper are stable and will not respond to saline.
The copper jewelry color is yellow with red, fake, darker luster, soft texture, and light weight. Copper alloy jewelry (copper tin alloy), white color, hard and light quality, long -term coloring, will make the skin darker.

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1. Whether gold has white highlights
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Misted with materials to cut the gold or gold jewelry, and observe the cut surface with a magnifying glass. If you see a white highlight, because the gold and 铱 cannot be fused together, it means that the gold is mixed with 铱.
2, measured the proportion
Prome the weight of a pure gold with an balance, and then put the gold in a measuring cup and flood the gold. Then put the detected gold in a measuring cup, and observe whether the scale of the water rises or decreases. As long as it changes, it means that the gold is not pure gold. But if it is gold jewelry, this method is not applicable because there is air in gold jewelry.
3, real gold is not afraid of fire refining
This to burn the gold on the fire for a while to observe its changes. Because the oxidation reaction will occur with the oxygen in the air, the gold with insufficient purity will become gray; and the color of the pure gold will be red after the fire is baked. However, this method may be destroyed to jewelry.

There will be no chemical reactions (there will be no gas generation, nor does color change), otherwise, it is not true gold. If it is a fake gold, there will be no reaction to soaking in salt water, because the response of salt water and fake gold will take a long time, at least it must be calculated by the day, and it can not be seen at all for dozens of hours. Even if there is only a slight difference, it is not easy to judge gold without gold.

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