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· Registered User
18,706 Posts
A little science.
As Sudsy just stated the red color isnt invisible it just turns grey. That point about leader material is due to its refractory index. (the ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other )

Simply put, water has a refractory index of 1.33, and if your leader had that same refractory index it would be totally invisible in water. Fluorocarbon leaders have a refractory index of 1.42 - compared to an index value of 1.62 for nylon monofilament.
Their own promo is misleading.
How does cajun Line dissappear?
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