Hey, we all want to look good at the Beach! Why do you see Lifeguards walking around with white (or Pink) noses? Zinc Oxide, most likely. Sunscreens can be classified into two categories: chemical and physical. Chemical sunscreens absorb into the skin and absorb UV rays to protect the skin from the sun. Chemical sunscreens also use chemical UV filters. Physical sunscreens, those that use zinc oxide as their UV filters, are commonly called "sunblock" because they prevent UV ra