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It looks very black
Organic matirials such as urine or semen glow a sort of white-ish purple, however the detecting factor is that they glow.
It would be a dark shade of red, becasue there isn't much red light for it to reflect.
With crayons, it looked like a light gray color
Urine!
BLACK.
yes it does
It looks very black
Light gray or silver generally do. Dark gray tends to not light up like white or silver do. Most light colors glow a little under black light, though.
a black T-shirt
The reason a black object is described as "a black object" is becasuse even under white light, where every color is available, the thing absorbs all of them, and doesn't reflect any color. Illuminating it with light of only a single color isn't going to change that. It'll still appear black.
It would look like a Bumblebee
Blue appears black under a yellow light. For example if you have a blue car and you put a yellow light on it will appear black due to the absence of color. The light has nothing to reflect back.
All raccoon urine smells like Ammonia just like Cat urine. You can buy raccoon urine as a cover scent for hunting on Amazon and find out yourself.
An octopus does spay urine on it's enemies. The urine would look like black ink.
Organic matirials such as urine or semen glow a sort of white-ish purple, however the detecting factor is that they glow.
No it would not since it is only white pigment. There are black light tattoos available using UV ink but results are mixed, and most people report loosing the black light aspect of it within about a year. The ink is supposed to be barely visible in most light, but some people report a yellowing of the ink after a period of time as well.