1, check the hardness
The higher the fineness of copper jewelry, the softer the texture and the whiter and smoother the surface. Take a copper bracelet of about 60 grams as an example. If you pull it by hand, it will open and have no elasticity, and the color is about 95%. If it is a little elastic, the color is about 80%-90%; If the elasticity is large, the fineness is below 70%.
2. Look at these stubble
Cut or fold copper ornaments to see the color of stubble. If the jewelry is soft, the stubble is thick and soft, slightly red, and the color is about 95%; If you bend hard by hand, the stubble is white gray or reddish, and the color is about 90%; If the hardness is large, the stubble is reddish, yellowish white or light gray, and the color is about 80%; If it is a hard bend, the stubble is reddish, yellowish, khaki and other colors, and the color is about 70%; If the stubble is red, medium and black or yellow, the color is below 60%.
3. Butterfly pass rolling method
Pinch with fingers, soft and elastic, high color, easy to bend, not easy to break; The quality of the bend is hard, or barely moving, and some can't even move their fingers; Bending of copper-clad or knocking with a hammer will crack; Fake ones can't stand bending and break easily.
4. Throwing method
High-quality copper ornaments can't jump high on the table, and there is a "poop" sound; Fake or poor quality is relatively light, and it bounces high when thrown on the table, making a crisp sound.
Jin Shunfu jewelry has many attractive pure copper jewelry, including rings, bracelets, necklaces, watches, armbands, almost as long as you can think of pure copper jewelry. Whether there is magnetic jewelry that can gain health benefits from wearing it often has important aesthetic value. The best skills to use copper jewelry include trying different techniques and considering their completion. Untreated copper, with the passage of time, the surface will become shiny and discolored. Two pieces of copper and thread can be used to make interesting earrings, necklaces, bracelets and rings.
Extended data
Pure copper, as the name implies, is the copper with the highest copper content, because it is purple in color, and it is also called red copper. The main component is copper plus silver, with the content of 99.5 ~ 99.95%. Main impurity elements: phosphorus, bismuth, antimony, arsenic, iron, nickel, lead, tin, sulfur, zinc, oxygen, etc. Used for manufacturing conductive devices, advanced copper alloys and copper-based alloys.
Baidu encyclopedia-pure copper