I bought an olive line the other days as opposed to the ivory color that the line came in. My purpose was stealth. After the line was all spooled up and I got home it dawned on me, the sky is not a dark color! We often judge things based on what we can see, not what the fish see. Clearly, an olive line is going to stand out more with a blue sky or white clouds above it than the ivory would have! As stated by someone else, with the light hitting the line from above, it will probably stand out and look dark from below no matter what the color. I think it may be time to break out the waterproof camera and some different colored lines.