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I read somewhere that yellow and black is most viz color combo because of contrast. The insurance companies.....school buses...follow the money.
It's less a question of brightness than of what gets attention and Andy is right....I can see his helmet from the moon as long as it's daylight time. Not sure what scientific explaination is but...I think I recall from my scuba days that green does not change color underwater whereas all other colors do...kind of dovetails to the subject ? I believe the recent flood of fluorescent green safety stuff is the development of fluorescent type pigments that do not bleach out under UV (sun) light .
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