Every light source has a unique color. This is a counterintuitive notion because people assume all light is neutral, or "white." But that's not the case. Candles, for example, put out a very reddish light; Sunlight is extremely blue. Fluorescent lights put out a sick green color.

This seems odd, since the world doesn't seem blue-ish on a sunny day. And when grandma blew out the candles on her birthday cake, her skin didn't seem beet red; it looked normal. The reason these color shifts are not noticeable is that the human eye and brain have an amazing power to compensate for variances in the color of light. Film and  video cameras are not quite so well adapted.