They are colloquially called mineral and chemical sunscreen based on how they work. Chemical sunscreens are usually more transparent or clear than some mineral sunscreens. Chemical sunscreens also tend to be more likely to cause a rash or sensitivity“Some people who say that they hate sunscreen are usually referring to a chemical sunscreen, because it can be a little irritating. It is best to apply a chemical sunscreen at least 15 minutes before going out in the sun since it takes extra time to absorb than a mineral sunscreen does. Both mineral and chemical sunscreen will lose potency over time due to sweating, swimming, and general sloughing off of the skin.