I've had deer walk as close to me while wearing my blue/black plaid Filson Double Mackinaw, as when wearing full camo. Guess they were either color blind, didn't read the book, or didn't care there was a little more blue in their environment. Blue sky and water must drive the buggers nuts. Rocket scientists they ain't, and I doubt they can cipher the connection between a piece of blue tape and the toter's ill-will. Unless of course you're using your rifle for semaphoring.