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Why not just spool the whole reel with fluorocarbon? Thats what I do instead of having to mess around with a leader. You get the low stretch of braided lines(well, almost. Far less stretch then mono) and lower "memory" then mono. Plus it is UV resistant. And you get very low visibility and much better sensitivity and hook sets then mono. I use Vanish 8# and 10# year around. If I ever fish very deep(rarely), then braided super line and a leader would probably be the way to go.
If your asking about the color of the PP it won't matter, your leader is what is going to be seen most. And if your using clear fluro as the leader color doesn't matter since it has the same refraction as water and is therefor almost invisible
Are you going to be hole hoping while fishing for lakers or in a heated house? The reason i ask is because braided lines + water + cold = one really big frozen mess on your spool. I think braid would be an excellent option to use for deep water lakers so long as it isnt subjected to being outside in the cold air for long periods of time. As for color, i want to say that they offer moss green, red, yellow, and maybe white. Of those colors and for what you are doing i would go with either the moss green or the red. You should be able to watch your line a little bit better with the red as it would stand out a little better against the snow then the moss green.
Thanks for the input guys, you've given me a couple of better ideas in how to approach this.
if you want your line to be invisable go with the red because As line descends below the surface, water absorbs the wavelengths of light selectively, one by one, as depth increases. Red is the first color to disappear, at a depth of 15 feet (which is why underwater photographers often use red filters to restore red colors in their pictures