Pink is the last colour that they see fade out in deep water so, in very clear water, a brightly-coloured bait will easily be seen.
However, in murky water fish rely very little on sight and that’s when scent takes over.
The only variant on this is when fish are swimming well off the bottom of a river or lake. In this instance, they can see the difference between a light and a dark-coloured bait as a silhouette.