Huh? The oxidation rate of copper in a controlled atmosphere is SLOWED by having the copper purer? Gimme a break, huh? The addition of other elements usually SLOWS the oxidation rate (stainless steel is a good example).
Six 9s copper may LOOK shinier, but I doubt that its surface layer is anything but non-conductive oxide. Just like aluminum...and UNLIKE silver.
Six 9s copper may LOOK shinier, but I doubt that its surface layer is anything but non-conductive oxide. Just like aluminum...and UNLIKE silver.