Elmo, the fox underwater YouTube video I posted in zigs shows how red yellow and black perform underwater. OK they are in the same lake, but interesting how the yellow performs.
I've never done so well with yellow, although my only fish from the car park came on a yellow topped snowman. In about 8 ft of relatively clear water. The previous syndicate, gin clear I couldn't catch using coloured pop ups, yet matched to the freebies, I did very well.