Petrol tank.

My candy apple roadster tank is original and the underside is the same colour, though obviously not in any way polished. My interstate tank is the same, but it's black, so that won't provide any evidence one way or the other.
 
My original blue Interstate fibreglass tank was black on the bottom but they were made in two halves, upper and lower. I bought a replacement steel one which was the same colour all over.
 
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