Amanda Lam is a cosmetic chemist in Los Angeles. Hadley King, MD, is a board-certified dermatologist in New York City.

Whether you're wearing brown, blue or green lenses, this is how your sunglasses' color affects their performance.

The characteristic yellowish-green tint of U.S. currency is another distinctive feature which is, in fact, hard for color photocopiers to accurately match. Red and blue fibers have been a longtime ...