I don't believe color has any bearing on spooking the fish. When fish look up any line will be silhouetted and appear as black to them. The color will make it easier for us to see the line. The heavier the line the larger the silhouette and I don't know how that may impact spooking the fish. I think the softer the presentation and the ability to pick up the line without creating that ripping sound are definitely more important.