Red-green colour blind also. Peroxide and blue or yellow flagging tape. Tie the flagging tape at every blood spot so you can return if you are having trouble finding the trail. Best alternative is a very good shot and short trail but we all know that sometimes we have to follow a little blood. Never quit!!!  Bob

Do not give up! Maybe you could join a local hunting club and make friends with a few younger fellas who wouldn't mind helping you track an animal. Just think , they could get to learn a few tricks from someone who has been hunting longer than themselves. While at the same time you will get companionship and someone to help track. I suggest going to local clubs, shoots, whatever it takes to make some contacts in case they are needed.

I am also VERY colorblind and it is a drawback, no question about it.   Having said that, I've wounded and also made several killing shots on deer that I wasn't able to recover, hunting with a bow and with a gun.   When that has happened I have, on a couple of occasions, retired my tag for the season, so to speak, but most of the time I don't.  

Nothing goes to waste in nature and my inability to recover a particular animal, though unfortunate for me, isn't for the varmints that can use the protein for the winter.

Improvise, adapt, overcome... hunt!

Blood trailing is only one method of trailing a wounded deer. Following the foot prints, the animals stride and other distinguishing markings also works. Years ago I shot a nice 8 point. Besides myself I had 3 other guys helping to track it, each with a different method. One followed the blood, another followed the deers tracks(distinct hoof print) and the other followed the trail by observing the vegitation along the trail(leaning in the direction of travel or overturned leaves, etc). We never recovered the deer but we followed his trail for about 1000 yards over two 5 hour sessions. I noticed he was marking his scrapes the next week by his distinct hoof print.
 Hydrogen peroxide sprayed on body fluids will instantly foam. You can use this to find droplets that folks with normal vision would have a hard time finding.