The US Food and Drug Administration's recent approval of its first new sunscreen ingredient in decades is like a flashing green light for South Korea, long practiced in the art of sunscreen, though it may not be quite as green as it seems. The agency approved bemotrizinol, or BEMT, the first new sunscreen active ingredient since the late 1990s, by amending the existing sunscreen monograph, with the new rules to take effect Aug. 9. In the US, sunscreens are regulated as over-the-counter drugs, an