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Again, redness, tones, saltiness are not behaviors. Mentally experiencing those things are the behaviors.

You say “Redness is a thing in itself that must be Explained… The Redness itself is very Mysterious.”

For whatever reason our neurology and eyes allow us to perceive colors.  So yes perceiving is a behavior. Tasting, seeing, hearing, feeling pain are perception behaviors.

I don’t get why “redness” is supposedly some mysterious, inexplicable thing.  We perceive colors due to different light waves (maybe with a little xtra brain processing to present an interpretation of the particular light waves that go with the particular color of a thing as Write4U suggested).