Ultraviolet-visible band reflectance spectra, recorded over time, of a ∼ 100 ML ethane ice film on a bare gold substrate held at 62 K. Reddening rapidly occurs at this temperature, with an ∼43% reduction in reflectance at ∼300 nm occurring in only about 28 minutes, a rate which can be extrapolated to 50% reduction after 33 minutes. These experiments were carried out at the Lowell Observatory-Northern Arizona University Astrophysical Materials Laboratory.