Fact is black is more easily an accepted color by the vast majority of people at any given day, than say... a shade of ocean blue, shocking pink or flaming orange.
Henry Ford's Model T proved that.
In some circles, black is thought of as devoid of having "color", as is white.
But of all the colors on a used car, it has been said that silver has the fastest resale value.
Depending on the type of finishes placed on a blacken knife, black oxide offers the truest tactical flat finish but unfortunately isn't a hardwearing material.
On top of that, I've seen some rather strange coatings for tactical black finishes which appear to be entirely glossy that it never fails to pick up every reflection and mirrors all light right back.
Military Specifications are quite clear about coatings being non reflective in nature. Check out your bayonets, all metal parts are dulled down entirely right to the snap buttons and hooks.
No noise and no reflection is the key to battlefield survival; and this applies to a hunter of wild game as well. So, we certainly don't want to give away our positions now, do we?!