Clubs and amusement parks use special black light paint that glows different colors. You can also buy fluorescent black light bubbles, invisible black light ink, fluorescent black light carpet and even fluorescent black light hair gel. Ordinary highlighters work well as black light pens..
The definition of a nutrient is something that provides nourishment, food or substances necessary for growth. Protein is an example of a nutrient.
Medical Definition of NUTRITION. 1. : the act or process of nourishing or being nourished; specifically: the sum of the processes by which an animal or plant takes in and utilizes food substances. 2.