Tesla List wrote: > > Original Poster: "Ben McMillen" <sammac-at-cobweb-dot-net> > > I read somewhere that you shouldn't use black or grey PVC for a secondary > coil form. Is there any reason and/or truth to this? If so then why? > > Ben McMillen > sammac-at-cobweb-dot-net I've used grey PVC for high-frequency coil forms and for the insulating column in a van De Graaf generator and it works just fine. Can't comment on black. Ed