
Not sure the color really has that much to do with it. If a fish is attracted to neon green or orange flies, why would the same color line spook them? I think unnatural movement is what spooks them and when false casting the movement or the shadow of the line. I mostly saltwater fish and have caught fish in clear water and light colored bottom with a dark colored line and in dark colored bottom with light colored line. I do have some clear tip lines, but what is interesting is the rest of the line is bright yellow.
Some waters and/or fish are finicky, where line color may make difference. But likely these are the exception, not the rule.
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