colour of floating lines

[Andre]

But if the flyline drags then that is unnatural to the fish and spooks it..

Yes, about time someone brought this up. Regardless of colour of the line, poor fishing is going to result in spooked fish. Doesn't matter about the shirt colour, line colour or anything else...fish properly, and you will be fine, fish badly, and all the camo on earth, invisible lines etc, ain't going to help.