Digital BW, The Print

While I was consulting at Crane & Co. on Museo II I looked at a lot of
papers under strong, controlled UV illumination. The common OBs used in most
papers fluoresce under UV like you wouldn't believe. Dramatic difference
between the papers with and without (Museo papers have no Obs). Yes, they do
cause yellowing when they fade, but some fade faster than others. The other
significant concern is what this fluorescence does to prints viewed under
mixed light sources that contain a strong component of UV (such as
daylight). Can you say metamerism?

Rick Colson