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Here's the deal. The film of gasoline is super thin, on the order of a couple wavelengths of light. When it's thickness is a multiple of a particular wavelength, you see that color (from a particular angle). Since the thickness of the film varies slightly, you will see several colors. Also, the angle at which you view the film matters. This was the short short version.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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