Colors look great! This is particularly noticeable in the sun. However, a side-by-side comparison of a flashlight and a UV flashlight illuminated at a dilution of 1:12,000 reveals no noticeable difference in visibility. a couple for a full bath, hoping this will soil the foam insulation where it leaked. Although the water in the bath looked rather red, neither red nor UV fluorescence was visible in the exiting liquid. Perhaps this plan could work with a much higher concentration of the dye. I'm still trying to dig up the styrofoam and find leaks :/
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