Last year me and a friend came up with a spray that foams up orange when it comes in contact with proteins found in blood. This helps when the blood trail gets lite or down to small drops of blood.
Some testing we did last year found that it would work on blood that had been on grass for 16 hours. We also put it on a small blood sport from where a deer that was shot has died. A week later we went back and sprayed the spot and it worked. Other nice thing is it is scent and odor free so it would not scary deer if you had to go into bedding area or places where hide. We are in the process of getting a patent. My question is do you all think it would be something you would like to have as a back up in trailing big game. We are looking at selling a 16 oz. bottle for around $ 12.00 and maybe a gallon refill in or around $ 20.00.
Please give me you feed back.

If you didn't know where the blood was you would need a 55 gallow drum with a pressure sprayer to find it. I think hydrogen pyroxide will do the same thing.

Baking soda water, and soap has the same effect. but id have to agree with the above post u would have to be spraying about 3 from the ground also.

I agree hydrogen pyroxide will do the same and doesn't smell also and for less money

The gimmick will sell with newbies for a season, then be dead in the water. Certainly nothing I have ever needed to carry.