Do you need a black light? Here’s where to order one online:
https://www.walmart.com/browse/home/black-lights/4044_133012_133113_8132195_5028614
https://www.amazon.com/black-light/s?k=black+light
Black lights also are known as ultraviolet lamps, UV-A light, and Wood’s lamp. The name “Wood’s lamp” honors Robert Williams Wood, the inventor of glass UV filters. Nearly all of the light of a good black light should be in the UV portion of the spectrum, with very little visible light.