I am lucky I guess in that I dont get anxious around sharks. I am usually quite happy to continue spearing fish around them so long as it is controlled & they are well behaved. I'm prepared to kill them if I have too, I rarely do, but this is my attitude & it works. I was blue for a couple of weeks after one coral sea trip last year where I had been "shouldered" several times by sharks whilst fighting tuna, but not bitten. Was it just luck or something else? The sharks had no interest in me, just the fish. I also can never recall a shark biting another in a "frenzy". I have often seen sharks turn quickly from being passive to agressive as soon as an anxious diver enters the water. The colour of the wetsuit isnt important, it is the attitude & behaviour of the person in it which matters. If you are anxious around sharks, they will pick it up quickly, no matter what colour wetsuit you wear.