The lume plots on the dial are tritium which ages over time. Usual colors are a cream color or a lime green, depending on the batch used. With the hands, original ones usually age around the same pace.
With the skeleton hands, sometimes the lume would breakdown and if it was sent in for a service, the replacement hands had super luminova, which is white in color. At the time, it wasn't as noticeable since the tritium lume hadn't aged much and was still around the same color.