A couple of weeks ago, we wrote about Shadow Fly Fishing's introduction of their industry-first custom colored "Seeker" fly lines. Shadow has also since introduced a double taper version of these lines, which are now available for pre-order. Since their introduction, these lines have reportedly been selling like hot cakes, presumably due to their surprisingly low pricing, customization options or both.
Fly line coloring is sometimes little more than an aesthetic choice while in other cases coloration may be a valuable tool to the fisherman. While there may be little difference between a fluorescent yellow and a fluorescent green fly line, a line with a colored shooting head that helps the angler know where the best load point is on the line or one with a high-visibility colored tip section for detecting strikes may help increase an angler's effectiveness.