Near the entrance, metal shelves taller than a man were laden with over one thousand jumbo jars of glitter samples arranged by formulation, color, and size: emerald hearts, pewter diamonds, and what appeared to be samples of the night sky collected from over the Atlantic Ocean. There were neon sparkles so pink you have only seen them in dreams, and rainbow hues that were simultaneously lilac and mint and all the colors of a fire. On one shelf, hundreds of jars of iridescent white fairly glowed. The prettiest shade was slightly violet.
From Caity Weaver, explaining a strange trip into a glitter factory. The uses for glitter go beyond cosmetic:
Researchers and zookeepers sometimes mix glitter with animal feed to track animals (polar bears; elephants; domestic cats) via sparkly feces. Plywood manufacturers insert hidden layers of colored glitter in their products to prevent counterfeiting. Because glitter is difficult to remove completely from an area into which it has been introduced, and because individual varieties can be distinguished under a microscope, it can serve as useful crime scene evidence; years ago the F.B.I. contacted Glitterex to catalog samples of its products.