
What do you get when you cross a mylar film with given compounds, polymers and UV light? The answer, in this patent application, isn't clear—it's blue. And it indicates when a sunscreen has run its protective course.
What do you get when you cross a mylar film with given compounds, polymers and UV light? The answer, in this patent application, isn't clear—it's blue. And it indicates when a sunscreen has run its protective course.