Though deer are not completely color blind, they are nearly so. However, it is still important to match the habitat in camouflage color and pattern. What the deer don't see in hue, they can see in tonal contrast. A bright green and an olive drab look as different to a deer as they do to you and me, just in a different way.
Reflectance is a big issue. The best camouflage is drab and dull in both color and finish. Different fabrics take dye differently and reflect light differently.
Deer are more sensitive to the ultra-violet spectrum than we are. Hunting clothes should be washed in a pure soap or a detergent that contains no brighteners. There are products called "UV Killers" available that eliminate ultra-violet reflection.
When camo becomes faded, it loses its contrast and much of its camouflaging effectiveness. It also becomes lighter in color and reflects more light. Replace faded camo garments with new ones having a fresh, crisp pattern.
By Bill Jordan