I have heard blaze orange looks in the grey shade to deer, but don't really know. I have read and heard many say the see only white, gray and black shades...but yet others like the previous poster mentioned. All I know for sure is they don't see colour and shades like we do. They see alot of UV spectrum, hence why guys buy UV killer wash or suggest air drying clothing. These UV's are not caused by bright clothing, just some of our washing and drying material greaten the effect.(brightener's in luandry soap and such)