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It is generally accepted that deer see colours more towards the blue end of the colour spectrum, rather than the orange colours on the other end of the colour spectrum. This is why hunters wear blaze orange, which deer suposedly find hard to see. Optical brighteners such as Uvitex are added to some laundry powders - "to make your whites brighter". These optical brighteners are towards the far end of the blue colour spectrum & do react under a UV light, so to a deer they may seem to glow an electric blue colour.
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