2012/2/1 Roger Breton <graxx@xxxxxxxxxxxx> > The best policy is to avoid optically-brightened paper altogether, when > possible. What to do when you don't know, used fluorescent components in this paper or not? So UV cut instrument is best, when prints is evaluated in non-UV viewing light on any kind of paper (with brightener or not)? Which light sources have no UV in their spectrum? And instrument without UV filter give correct measurement results when paper have fluorescent components and it viewed in light that have UV, or when paper have no brightener and it viewed in any lighting conditions?