Ultra-Violet Light

Sometimes called Black Light, ultra-violet light makes things glow, It's called fluorescence.

   

Have you heard of laundry detergents that make your clothes "white and bright"? Well, they put stuff in the detergent that glows under ultra-violet light.

   
White Light
 UV Light

 

 Some rocks glow under UV light
 Teeth glow, and so do Roger's contact lenses

The Physics: You've probably heard of fluorescent lights. Well, now you know what makes them light. The bulb contains a gas that emits ultra-violet (UV) light when it is turned on.  That UV light makes the coating on the glass glow. And, if you've seen the inside of a tanning booth, you'll probably notice that those bulbs they use, look a lot like fluorescent light bulbs. Well, they are, they just use a different type of glass - one that lets the UV light through.