I have a 10 in Lodge (pre 1960 - no country of origin, 3 notch ring) and an 8 in BSR (post 1960, solid ring). I am having trouble cleaning and seasoning. I have placed both in a SCO and they come out ‘clean’. When I attempt to season with canola oil, the oil turns black on the Lodge and rusty on the BSR. What am I doing wrong? I would like to use the skillets but these colors are not appetizing.