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.
Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as fats, proteins, vitamins, or minerals.