Well I knew the second part. I also knew that deer rely on scent far more than vision to spot predators. What I didn't know is why hunting laws specifically call for the use of blaze orange (also fluorescent pink). Not the caution yellow or that greenish yellow you see a lot in construction and high visibility garments, but specially blaze orange. It makes perfect sense if the orange still works as camo from the deer, but is extra visible to other hunters. That's like a best case scenario color.