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Maybe they could inject a dye that was not visible to the eye, but that the cameras could pick up, and then overlay it digitally in some way to the tv audience.



What about dye that is only visible to UV light?


That was my first thought as well.


Barium, like for medical tests. Radioactivity solves everything!


I'm thinking along the same lines. I'd really like to find a chemist to work on the project with.




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