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    • Huh. Former geophysicist here and I have no idea... I asked Google and Google seemed to say, "Sorry, I don't have big enough data to know about that."

      Anyone know what the purple is? Louis? It's beautiful. It looks like that under regular daylight?

    • Well. It's not Photoshop. And it doesn't look like that normally. But with the flash on, that's how it does look. Here it is without.

    • Oh, that's crazy. What kind of camera and flash?

      Back in my geophysics days we designed 7-band cameras for satellites: Two UV bands, two infrared, and three visible bands. That's how we could tell so much about vegetation, water, etc.

      That helped immensely when the world went digital because the sensors picked up near-infrared and the flashes emitted it. Depending on how much melanin you had in your skin, the near-infrared would penetrate your skin, be reflected back to the camera, and make you look red. So you'd get lobster newborns under flash and one person in a group would go red in front of the camera and no one knew why.

      But I knew why and was able to put a filter over the flash to prevent it. So I ended up talking to the flash and camera companies and now you don't see it as much.

      Some researchers in the medical community tried to use it to map out venous structures but if you got a tan, or you genetically had a lot of melanin like blacks do, no light bands would penetrate the skin, including UV.

      A fascinating thing that emerged was white people who ate colorful fruits and vegetables had skin that was hard to penetrate because the body's natural sun defense is to absorb the carotenoids in the skin as natural sunscreen, foiling our ability to penetrate the skin with light of any band.

      For example, if you take an average white person and hold a UV rod over one of their butt cheeks for a few minutes, they get burned. Then feed them tomato sauce every day for 6 weeks and hold the same UV rod over the other butt cheek for the same amount of time. No burn.

      That's probably one way colorful fruits and veggies prevent cancer.