The characteristics of copper are ductility, thermal conductivity, conductivity and diamagnetism.Copper is a tough, soft, ductile purplish red and shiny metal, also known as red copper. One gram of copper can be pulled into a 3000 meter long filament, or pressed into an almost transparent copper foil of more than 10 square meters. Pure copper has high conductivity and thermal conductivity, second only to silver, but copper is much cheaper than silver.The color of copper is very similar to gold, and the color of hydrated copper ion is blue.Copper has a certain toxicity, because it is not easy to dissolve, and its toxicity is much weaker than that of soluble copper salts. Copper processed by specific processing methods is not toxic.