1 thought on “How to identify the difference between gold and copper?”
Joanna
The first method: This to burn with fire, the copper ring will turn black, and gold will not change color. However, our usual lighter temperature cannot be reached. We can try to use the fire of the gas stove and burn for a few minutes to see. However, this method is not applicable to K gold, which is the identification of 18K gold. The second method: It can be seen from the jewelry mark. 999, 18K, or AU750. If the jewelry is copper -plated, some are not identified, and some will be marked with English GK, which means gold plating. The third method: This to listen to the sound on the ground. This method Xiao Zheng once specifically shot a video explanation. The copper sound was echoed and the sound was crispy. The sound of the gold was no echo, and the sound of the sound was stuffy. The fourth method: The hardness of gold, the hardness of the gold, such as the gold ring, the gold can be pinched slightly, but because the copper is too hard, it is impossible to pinch. The fifth method: This with sulfuric acid, or nitric acid to soak and identify. Copper jewelry is soaked with sulfuric acid for a long time, and the color of the chemical reaction will turn black, and gold will not. If the copper jewelry will develop a severe chemical reaction immediately when you encounter nitric acid, gold will not.
The first method:
This to burn with fire, the copper ring will turn black, and gold will not change color. However, our usual lighter temperature cannot be reached. We can try to use the fire of the gas stove and burn for a few minutes to see. However, this method is not applicable to K gold, which is the identification of 18K gold.
The second method:
It can be seen from the jewelry mark. 999, 18K, or AU750. If the jewelry is copper -plated, some are not identified, and some will be marked with English GK, which means gold plating.
The third method:
This to listen to the sound on the ground. This method Xiao Zheng once specifically shot a video explanation. The copper sound was echoed and the sound was crispy. The sound of the gold was no echo, and the sound of the sound was stuffy.
The fourth method:
The hardness of gold, the hardness of the gold, such as the gold ring, the gold can be pinched slightly, but because the copper is too hard, it is impossible to pinch.
The fifth method:
This with sulfuric acid, or nitric acid to soak and identify. Copper jewelry is soaked with sulfuric acid for a long time, and the color of the chemical reaction will turn black, and gold will not. If the copper jewelry will develop a severe chemical reaction immediately when you encounter nitric acid, gold will not.