I found this semi-old spool of kanthal in my drawer that was unopened, I threw out the packaging so I don't remember what it the company was but it was something along the lines of "Tuff #24 galvanized kanthal resistance wire" but I built a couple of coils and they all short, I've tried it on 3 diff attys and still shorts, I made sure its not touching any other metal or anything. It was a dirty but i washed it with soap and water and its not grimy or greasy from machine oil but parts of it aren't shiny like wire is supposed to be they're gray-blackish. Is that causing the problem.