>To: tesla-at-pupman-dot-com >Subject: Re: Radius of curvature and misc ramblings > >You can also use graphite and plate with copper. Steve > Steve >Copper corrodes very quickly and ends up green. Can I use Chromium plating instead of copper for the Toroid? It looks better anyway. Also do I need to coat the centre piece or is it just the doughnut that needs plating? Thanks, Paul Millott