doing a bit of reading up on the visibility of line colour and i found an interesting point, a fishes (baitfish's) underbelly is often white so as when a predator is looking up for feed it isnt as visible as what it would be with a dark underbelly, so in theary a white line is going to be least visible from the bottom, ill try and finds the artice i read it in

Tackle Dangler

what about red its the first part of the light spectrum to dispurse under water?

The color selection was as carefully determined as was the decision to use 8 braids. First, we ask what color was the most invisible to the fish. The answer was found in nature – fish have a white colored belly. The hint was in the obvious fact of how fish defend themselves in nature. However, don’t fish also have a black back? Well, the black color is veiled when looking into the sea, but when fish go for the bait, they look above themselves to catch bait, and so we can say that white is the color that is least visible to them. An unmarked plain white line would have actually been the most ideal, but for the fisherman, it is crucial to know the depth of the water, so we added markings (orange color) every 10m/33ft. (the 50m/164ft. markings are in black). Moreover, a silicon coating was utilized instead of the normal wax coating, leading to excellent performance in jigging and for all casting games.

a quote from http://www.anglers-proshop.com/product_view.php?product_id=161

Tackle Dangler

street, thats true about red but dont trust that cajun line. Its tough stuff but doesnt go clear underwater at all(berkley proved em wrong!)

really thanks 4 that shizz

dont get me wrong, cajun is tough line, but all the stuff about it being invisible is bollocks :P