Black Light App To See Stains. If you shine the light in a dark room, cat urine will glow yellow or green, making it easy to see exactly where you need to clean. Your not making a blacklight.
Carry your black light into rooms or areas where you suspect possible mold contamination. You'll see the glow in both regular and diet tonic water. Some of the spills a person might find with a black light include:
Colour over the tape with the blue sharpie pen.
Then add a second piece of. All you need to know is that there are many things that have phosphors. You'll see the glow in both regular and diet tonic water. Black lights detect items that contain fluorescers within them when the uv rays from the light shine on them.