Can UV lights be white in colour?

Black lights have filtered glass to block out most of the visible light so you can see the black-light posters better. Germicidal UV has special glass that lets more of the UV through. Both kinds of lamps contain mercury vapor, as do ordinary fluorescent lights. read more

UV light is not visible to the human eye. The deep blue/purple you can see when the bulb is operating is just that; it is not the UV light. The bulbs have color filters that block most visible light with wavelengths below UV so that the phosphorescent effects of the UV light are easier to see. read more

However, a UV false color (UVFC) image, using a black light, reveals the artist’s pigments. You clearly see two different pigments for the left and right side of the shirt. read more