Long wavelength red-orange light is absorbed first, blues to violet (short wavelength) light is absorbed last, i.e.: penetrates deepest so these retain their color at greater depth
If the water is clear, you might get away with throwing them out in 10 12 feet of water, but the majority of bites come in 5 feet or less
PP is having quality control issues
Conversely, if you plan to pursue blue marlin using a foot-long baitfish-patterned streamer, youll want a 16 weight rod
STF is a synthetic dubbing that readily accepts a marker, so sometimes I'll tint the back olive, but mostly I just leave it white and flashy
Thats when its not as clear cut for me which to throw, so I often have both rigged and ready