Markers that show under a black light are known as "black light reflective markers", "UV black light reactive", "invisible ink markers", or "black light reflective ink". There are different manufacturers of these items typically available in law enforcement shops, online stores, and sometimes in art stores/departments.
Floating markers in the ocean are called buoys.
Ultraviolet Light Sensitive Phosphorus Powder.
No, black light is a common name for Ultra-Violet light. You cannot see UV radiation so some simple people have referred to it as black light.
If you look at the scientific name for them (permanent markers) you'll notice that, by name, they're permanent; thus making them permanent. The fact that they are permanent is best shown by the fact that they are called "Permanent Markers."
A black hole is a region of space from which nothing, including light, can escape. It is called "black" because it absorbs light that hits it, reflecting nothing.
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Nobody. The black light is a trivial name for ultraviolet radiation which human eyes don't respond to. (shorter wavelenght than blue)
Since nothing, not even light, can escape black holes, they are invisible (so to speak). You can only see a black hole when it is sucking up light, since the object with light looks like something is pulling it away.Actually, there isn't much imagination in this. Black holes are named as such because they are, basically, holes in the universe which emit no light.
black holes have such great gravity that nothing, not even light can escape them. That is why they were named "black holes".
the black market
black hole got it's name because when look at a black hole, you only see black. also if you drop an item in the black hole the item is gone because there is a hole in there. so that's how black hole get's its name