At work we have a light fixture that has developed an interesting character: the fluorescent bulbs (two in the same fixture, one turned several weeks before the other) have changed from white to a soft pink or rose color. I am curious why that should happen. IIRC the standard fluorescent ionizes a gas that produces UV that in turn causes a coating on the inside surface of the bulb to fluoresce and produce a light in the visible spectrum. Can the bulb start to fail such that the UV wavelength changes and subsequently causes the tube to fluoresce at a different color? The lights are a little dim after this change occurred and you can see what appear to be small bands of variable if brightness that move slowly down the length of the tube.
16 years ago