Deer aren't completely colourblind, they are just red-green colourblind, so can't really distinguish between the red and green colour spectrum (that's why tigers are orange; they stand out to us humans but through a deer's eyes they blend right in and the stripes break up their outline). They can see blue I believe, but blaze orange in really low light can look quite similar to red/ginger fur...I guess the most important thing is breaking up your shape/outline when you're standing still
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