Besides the rings i don't see any green stuff, so if you mean those, it's just their color, normally they're black, so they are probably discolored, but it's normal for them to not be metal, they're supposed to insulate
this post was submitted on 30 Nov 2023
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There was some oxidation i think on the base of it, the rings are green as well, I just didn't know if it was still ok to use