The US Navy did tests on colors other than yellow for the life jackets military pilots wear in case they have to eject and splash down in the ocean. They found that sharks were less likely to be attracted to red r black than what one wag called "yum, yum, yellow." However, those 1970s tests were a waste of time, researchers in Australia have said, because sharks - along with whales, dolphins and seals-are color-blind.

Research: Sharks are color-blind. (2012, October 4). Manila Bulletin, p. B-8.