That's it! That's what I was researching Nik! I was researching
  the health benefits of blueberries and seeing what else had
  those same properties. Then I came across an article about a new
  color they discovered in Port Wine that was a long lasting
  flourescent Ultramarine Blue and gave the number it absorbed. I
  searched in vain to find out "how do you find the color that
  absorbs another color?" ...- until I went into my paint program,
  plugged in the "coor it absorbs" and then inverted it - and it
  was the Ultramarine blue I was looking for. Quite exciting to
  me, actually. It makes me wonder: Would this color, that is
  naturally anti-oxidive - would clothing of this color be
  naturally UV protective? or would they get hotter? But that's my
  questioning/curious scientific mind going into overload on that
  one. "