Unique color filtering effect
Fish perceive fishing lines as a mixture of transmitted and reflected light in their vision, which they perceive as color and light/darkness.
Also considering that fish perceive the line as a silhouette, it is considered important for the function to combine the color filtering effect with transparency.
"Pink Fluorocarbon FISH CANNOT SEE" is a line with a unique color filtering function that not only cuts off (absorbs) a wide range of wavelengths in a specific range perceived by fish but also provides transparency.