This type of coat is rich, warm, and may have brown - reddish hue with white markings on the face. (snowyswan.com)
The device can either do it automatically using a light sensor adjusting over the course of the day, or the user can set a predetermined bedtime for the system to switch over to a far more reddish hue. (techcrunch.com)
(Note the lightly reddish hue of the cake using natural cocoa. (seriouseats.com)