RE: Color Blind
A lot of blood trailing comes down to woodsmanship. Know what to do when the blood trail stops or a bad arrow placement happens, is what makes a bad situation into a successful one. My outfitting/hunting partner is color blind in the same fashion you are. I poke fun at him all the time when we are trailing but a better deer trailer you' ll never find. Because of his limitations in color vision, he' s learned to trail deer by scuffed leaves, broken twigs, paths of least resistance and just common sense. When the blood quits he' s the guy you want out front, otherwise he lags behind swearing he can' t see the blood we walking past.
Many of the sprays and manufactured aids will help you when the going gets tough but nothing beats a well placed arrow knowing what to do on bad hits and good woodsmanship.