What I don't get is: Two wings of identical design and an identical
starting
temp, both sitting out on a cold February night (no sun). How does the
dark
wing get colder than the white wing?

Visible light and infrared radiation (heat) are both forms of
electromagnetic radiation, they just have different values of
frequency/wavelength. Objects that are absorptive or reflective of
radiation in the visible spectrum can (but don't necessarily) also
exhibit the same or similar properties of absorption or reflection of
radiation in the infrared spectrum. I think.

-R