Why do some colours look different under UV light?

Well, if the ONLY light was UV then only things that absorb UV light energy and re-radiate it as visible light would be visible. read more

Another part of this though is that “black light” lamps usually produce some violet light as well as the “ultra-violet” that they are supposed to produce. This is usually very obvious. So for objects that don’t convert UV light, they are visible just as they would be under a violet lamp. read more

The color change of fluorescent minerals is most spectacular when they are illuminated in darkness by ultraviolet light (which is not visible to humans) and they release visible light. The photograph above is an example of this phenomenon. read more