Nylon overview: Water and conditions

Ordinary nylon is denser than water although surface effects can hold it up temporarily. Choose colour by background and line-watching needs; neither invisibility nor inevitable rejection is assured. Manage line bow in wind and current.

Line colour by water and background

• Clear water: check lure-end visibility; blue line may be hard to track against sky reflections.
• Green backgrounds: compare pink / blue if lime blends in; weeds do not imply turbid water.
• Tea stain: assess actual viewing distance; red line has no fixed invisibility depth.
• Muddy water: prioritize bite watching and control; close-range line visibility remains possible.

Water & light: evidence and limits

• Clear / bright surface — viewing direction matters. Fine and transparent lines can glint. Looking upward at sky differs from looking sideways at a dark bank. Application limit: evaluate lure-end visibility, not surface hue alone.
• Algal green — green does not mean invisible. Algae and particles alter spectrum and scattering; dark green can still form a silhouette. Application limit: assess angler and fish views separately.
• Tea-stained water — absorption differs from sediment haze. Dissolved organic material can give yellow-brown colour, with different optics from muddy water. Application limit: do not import clear-ocean disappearance depths.
• Muddy / turbid — visibility range often contracts. Particles scatter light; yellow's human-visible advantage declined with turbidity in the twine study. Application limit: fish may still detect line close up; bright line is not proven cost-free.
• Depth / slant path — losing red is not disappearing. Red light attenuates relatively fast in clear ocean water, but an object can retain a dark silhouette. Water composition changes attenuation. Application limit: no universal red-line disappearance depth; viewing distance and background matter.

The water guide applies optical and water-composition findings; it is not a measured bite-rate ranking. Wardle et al. (1991) observed strong glint from clear nylon parallel to the surface, reduced by some pale dyes in green illumination. Transparency or refractive index alone does not establish invisibility.

Sources: Wardle et al. (1991) — colour, orientation and nylon glint underwater, Fisheries Research — https://doi.org/10.1016/0165-7836(91)90078-T · Tsuda & Inoue (1973) — human underwater visibility of dyed twines, Nippon Suisan Gakkaishi — https://doi.org/10.2331/suisan.39.243 · NASA — water, phytoplankton, sediment and dissolved material affect colour — https://science.nasa.gov/earth/earth-observatory/shades-of-green-in-the-north-sea-76318/ · NOAA — light and colour in water — https://oceanexplorer.noaa.gov/lesson/bioluminescence-light-and-color/

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