I don't know what to think about what on what crappie see or don't see color wise .
we all FORGET their eyes are not like our eyes and what we see is for sure NOT what they see .
can they distinguish color ? I have no clue .
but to be sure color can make a big difference sometimes .
red and pink seem to trigger strikes sometimes and I imagine its because of the "blood in the water" syndrome.
sick bait and injured bait has shades of red and pink typically .
more often than not though I think its about having a lot of contrast and for whatever reason that varies from water to water .