I read that a blue light will show up blood, so I tried it. Not real successful. Remember that a blood trail is likely to be very thin, and a few tiny black spots on the weeds at night is not much going to be much help.
If it lit them up the way it does a dayglo label, THAT would help, but it doesn't.
I tried the blue lens on my Surefire Outdoorsman light and didn't have much luck trailing a deer I shot last fall. I think you need a fair amount of blood for it to work. Not really sure if would matter though.
Scott
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