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1. A light guide of a vehicle comprising: an elongated body including: an entrance face at which light is admitted into the light guide, wherein the entrance face includes a pattern of protuberances that disperse light of a wavelength; an exit face at which the light emanates from the light guide, with the exit face being opposite the entrance face; an inboard side wall and an outboard side wall extending between the entrance and the exit face, with a sidewall distance in the inboard sidewall from the entrance face to the exit face being longer than a perpendicular distance between the inboard sidewall and the outboard sidewall in the exit face and with the entrance face, the exit face, the inboard side wall and the outboard side wall enclosing a medium that includes a colorant so that the medium meets a color criterion while the medium is minimally absorptive at the wavelength, wherein the colorant formed in the light guide includes a concentration by which the medium meets the color criterion and has a molar extinction coefficient that is a minimal value at the wavelength with respect to at least one other colorant by which the medium would meet the color criterion, and with substantially all the light travelling the sidewall distance.
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