Originally Posted by Graham Benyon
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I lifted this from an American pike forum. The depths that red disappear are the key issue here, As you can see from the post red line doesnt become invisible till it gets down to at least 25 feet and so using it in our shallow rivers will not make any difference...
.....the first color that disappears as light penetrates water is red. This is why red fishing line is so effective. Red disappears at 15 to 30 feet of water. We all know that a line that is invisible to fish will not spook your target and lures look more natural. For this reason red will put you on more action in deeper presentations
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The first paragraph: the ideas expressed in this paragraph are sensible and very true, although the scientific rigour of the wording is very dodgy indeed.
But I think Graham, that the pike forum may have fallen for the usual trap .
That red light does not penetrate very deep is indeed true, (it is why so many underwater videos look blue)
BUT you are left with line that looks black, not an invisible line. You merely have a line that lacks the colour red because no red light from the surface has reached it. Line is red because it reflects red and absorbs most of the other colour frequencies. Absorb everything apart from red, and shine no red light on an object and it becomes black.
For a line to become invisible, light would have to pass right through it in a straight line, or it would have to take on the exact colour of its background. Neither of these happens.
A clear glass block underwater is very difficult to see ( apart from its edges). Paint that block red, and it will NOT disappear 25 feet or so down. The red paint will absorb all available colours and the block will look black.
Jerry's red line in air stands out to me like a sore thumb. In shallow water it will do the same, but as others have said, line choice is often down to what you feel comfortable with. When we can see DVD's showing barbel ignoring brightly coloured plastic toys, they are not going to bother too much what your line looks like. What it "feels like" is another story.
There is no point going diving with that pretty blonde in the red swimsuit. It will not disappear 25 feet down!