hair color

I have a silly question…how can you definitively tell what color body hair you have? I know it seems like a look and see type of thing, but I can’t tell if my hair is brown or red…my beard hair is red, not carrot red though…but my arm hair, leg hair and stomach hair is a bit hard to discern. At some angles and in some light it looks a little red…but in others it looks like a darker brown.