David H. Lipman wrote:

good. so which are the colors they are more sensitive to?
isn't there a scale?

Red !

The colour of blood is seen by most fish and can invoke a reaction.

did you read studies about this or are your conclusions?

Besides the weight issue, the
transition between red, clear and green helps the leader material to
not be see by blending into the background.

which transition of the leader? sorry I didn't understand

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ciao
Vittorix