So when last we left our heroes they couldn't figure out whether "Active UV" lighting was causing fluorescing off of mandarin ratsnakes or whether the white balance just needed adjusting. So I set a custom white balance under this strange light and took some more mandarin photos and here is what I got:

and for comparison here is one with an auto white balance under the same kind of light:

Here's one under regular fluorescent light with auto white balance:

Here's one with camera flash and auto white balance:

Conclusion:
It seems to be a white balance problem. Although I don't think my little PowerShot has the ability to compensate for the funky light I was using.