ReveaLED is synchronized UV LED flash light for smartphones and tablets. It fits to the audio jack of your device for discovering UV light photography under dark. It has a built-in rechargeable lithium-ion battery so you can use it without connecting it to the device.
There are many natural objects and substances fluoresce under ultraviolet and developed UV LED light reveals all details of the glowing objects and substances under dark including rocks and minerals, animals, many household items.
It can discover hidden watermarks on passports, money and other documents.
Fluorescent molecules tend to have rigid structures and delocalized electrons. For example hidden watermarks(money and checks), minerals, tonic water, some vitamins and drugs ,scorpions, toothpaste, antifreeze, fluorescent gems and minerals, body fluids, bank notes, laundry detergent, some animals, plants, fungi (especially marine life), highlighter pens, and much more.
The project has so far raised more than $22 thousands on Kickstarter, from more than 670 backers, with 23 days to go before the campaign ends. Those backing this campaign are promised delivery date of April 2016. It goes for $25 right now.