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.
Essential nutrients. An essential nutrient is a nutrient required for normal physiological function that cannot be synthesized in the body â either at all or in sufficient quantities â and thus must be obtained from a dietary source.