Black Light can be used for spectacular photography or just for having some photographic fun, but if you just want to try out a quick trick for testing your home for bacteria there is a way to do it for a couple of cents.
Turns out that a certain mix of sharpie ink will block all light but back light. The folks at Hefty.co made a quick tutorial on how it’s made.
You would need a blue Sharpie and a purple Sharpie and some tape. Applying two blue tape layers and one purple tape layer will act as a filter for the smartphone flash. In total darkness shining that flash onto anything will reflect any black light (or fluorescent emittance) from found objects.
FIND THIS INTERESTING? SHARE IT WITH YOUR FRIENDS!