Looks fine, take it off and clean it with some alcohol if you have to on a clean cloth. Probably got a thin layer of oil or something to help prevent initial rust but you don't want those vapors.
Just crank it up, once the soldering flux fumes etc hits it will start to change color. But original or clone it's only function is to hold the tip in place, as long as it's the correct size.
If you brought the part from a Chinese website or a seller on Ebay or Amazon a lot of them sell fakes. If you did send me a PM with a link if you like and I'll tell you.