I started using tracer feathers on my shafts years ago for a bear hunt. I use white, with a white nock. when that arrow hit the bear, it looked like a golf ball on its side.
They weight nothing, do not effect arrow flight, and you see your arrow real well, especially those low light condition shots.
If they get wet, they matt up on the shaft, but dried out they will fluff up with a little coaxing.
I apply them by wrapping fletch tape around the shaft a few times, and then the tracer feather. I trim them round even with feathers.
I've tried a few colors, pink or white work best. If you use pink, expect to catch some flak from your buddies, but at least you'll know where your arrow went.