You are right, in the bush and shadow the UV brighteners wont make much difference because there isn't direct sunlight getting through, it's more the filtered stuff. Out in the open they do make some difference and sometimes a lot, not as much as wearing something that is actually fluorescent but they still make us fluoresce. As noted by Yosemite Sam birds see UV. So do insects - that is how bees can see clover flowers in a pasture - the flowers fluoresce UV. If a deer sees a big blob of UV moving around a hill it is gonna turn to the deer beside it and while pointing a hoof say WTF !!
Then there is the electromagnet field around us that game picks up. That is why Bow Hunters wear those special suits Heck or Hecxs suits ??
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