I haven't done a lot of research on the UV brightening thing, but I don't buy into it a single bit from what I have seen or heard about. If an ad for a detergent I saw in a magazine was accurate, it makes you look more or less to a deerlike someone's gone over you with a highlighter. If that's what you're trying to tell me, forget it. Deer have sat and stared at me when I made a wrong move for what seems like hours and then looked away and went about their business. Break up your outline if you can and don't worry about something like UV brightening that certainly doesn't seem like it can be proved or supported is my 2 cents.