Digital BW, The Print

Robert Morrison writes:
 > [...]  Both [Photorag and German Etching] have optical brighteners in the
 > coating...I have no idea why they put them in German etching given its warm
 > color.

Robert,

How did you reach the conclusion that they contain brighteners.  I put
some samples under a black light and didn't observer any significant
fluorescing (especially compared to the peice of laser printer paper
laying next to them).

g.