I believe that deer do see some blues, but otherwise they see no colors. I use solid color blaze orange coat and pants when hunting and have had so many deer within 40 yards I couldn't hope to count them. Only a few have looked at me and those that did soon looked away. I have had deer walk right up within a few yards of me on a trail. On the other hand, when I have inadvertently moved, I have always been busted. There is no room for error on the movement issue as others have alluded.