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The purpose for blue bean bags is for ease in spotting them. If the beanbag is dropped on a yard line, the white blends in with the chalk/paint and makes the bag harder to spot. The difficulty in spotting the bag is more important in film review/grading/critique. The NFL spent lots of money doing studies on this issue.
Some conferences are even going to the orange beanbags. This is done because while it is easier to spot the blue bags during day games, it is sometimes difficult to pick them out during night games. The orange bags are easily spotted during all games.
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