What's the difference between electrolytic copper and copper?

I'm from the smelter. Let me put it simply:

"Electrolytic copper" is the final product of copper smelting process. It is not ingot-shaped, but sheet-shaped, with irregular edges (except after cutting) and uneven surface.

Electrolytic copper can be said to be pure copper, and its color is purplish red, so it is also called "red copper" or "red copper". However, in copper products, a small amount of other metals (such as zinc, etc. ) is added to improve the hardness or other properties of pure copper. Because of the small amount of addition and little color change, it is generally called "red copper" or "red copper".

If the added zinc exceeds a certain proportion, the color of copper will turn yellow, which is "brass". The hardness of brass is much higher, but its toughness and ductility are poor, and its conductivity is not as good as that of copper.