Copper is reddish-brown and has a very attractive appearance. Near its melting point it is brittle and can be powdered. When heated and then cooled slowly it is brittle, but with rapid cooling, it becomes soft, malleable arid ductile.

• 铜呈棕红色，外观很美。在接近熔点时，性脆，可研成末。加热后缓慢冷却其性极脆，但如迅速冷却则变软，可锻且具延展性。