Electrolytic copper, as its name implies, uses electrolysis to adsorb copper ions on the substrate to form copper foil. Therefore, it is characterized by strong conductivity but relatively weak bending resistance. Rolled copper is made by Copper foil is obtained by extrusion. It is characterized by good bending resistance, but its conductivity is weaker than electrolytic copper. It is mainly used for cameras in flip phones. From the appearance, electrolytic copper is red, and rolled copper is uneven. Yellow