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Spooky fish may not bite if they see a bright colored line. I'm sure somebody will post that this is nonsense, but fish aren't color blind. I use a white floating line most of the time which definitely is bright, but at least white is a color found in nature. Yellow or orange are not really colors that a trout would expect to see floating down a stream. Just my .02
My passion for catching fish is eclipsed only by the fish's passion not to be caught.