Ultraviolet induced visible fluorescence photography
Ultraviolet induced visible fluorescence (UVIVF) is the phenomenon that certain materials emit visible light when being exposed to ultraviolet light. I used a Convoy S2+ led flashlight for all of these photos. Some more information about this technique can be found here.
Remember that UV light is very harmful for your eyes, so always wear UV protection goggles. Some objects reflect some UV light back which will harm your eyes.