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.
noun, Biochemistry. 1. an essential nutrient, as a trace mineral or vitamin, that is required by an organism in minute amounts. micronutrient. 1. n. A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.