What's the difference between red copper and hardware?

No difference.

Red copper is pure copper, also known as red copper, is copper elemental, because of its color for purple and named.

Pure copper is a soft metal, the surface is just cut red orange with metallic luster, the elemental is purplish red. It has good ductility, high thermal and electrical conductivity, so it is the most commonly used material in cables and electrical and electronic components. It can also be used as building materials and can be composed of many kinds of alloys. In addition, copper is a durable metal and can be recycled many times without damaging its mechanical properties.