I'm in the process of building my first Tesla coil and am very excited to be doing so. I went out and bought a section of white pvc pipe for the secondary and out of cosmetic desire, I spray painted it matte black. As soon as I finished winding the wire onto it and varnishing it I read not to use anything black for the secondary as it could contain carbon or other interfering materials. Now I'm worried. Should I buy more magnet wire and wind up a new coil or will this one work without negative effect?