Apparently tan is a bad choice too.
I'm sure it's more of a "wrong place at the wrong time" sort of thing. But whatever makes you feel the safest possible, go for it.
http://sanfrancisco.cbslocal.com/201...a-state-beach/
And apparently hammerheads prefer green over orange/yellow. haha.
http://www.youtube.com/watch?v=eoiWtj-N49w