Jax, you just spray a mist and let it settle on the ground and bushes until you find the first blood, then hopefully you can get a pretty good idea of direction. There are better products out there now though. Blue Star is a chemical that we use working crime scenes. They now make a version of it just for hunters. The blood will glow very brightly when you hit it. With peroxide you are just watching for it to foam up. If the blood is just pin head specs, it can be hard to do. You just have to look very close. Peroxide is a lot cheaper however.