How do black (UV) lights work? How do black (ultraviolet) lights work? A black light looks dark purple, but most of the light it emits is in the ultraviolet (UV) range of the spectrum, which is invisible to the human eye. Under a UV light, white clothes, our UV poster [link], glow in the dark and many fluorescent coloured items emit a bright glow. What they all have in common is that they contain phosphors. A phosphor is any substance that absorbs energy and re-emits it as visible light. Under a black light, phosphors convert the UV radiation they receive into visible light.
Granola is a breakfast food and snack food consisting of rolled oats, nuts, honey, and sometimes puffed rice, that is usually baked until crisp. During the baking process the mixture is stirred to maintain a loose, breakfast cereal-type consistency. Dried fruits, such as raisins and dates, are sometimes added.
a breakfast cereal similar to granola, usually consisting of rolled oats and dried fruit. Origin of muesli. dialectal German. 1935-1940.