There is something very important missing in this discussion. Certain
light/UV sources very tremendously in their effectiveness depending on
whether one uses a platinum coating (as in 100% platinum) or palladium
coating. There is a discussion on this in the most recent editions of
_History and Practice of Platinum Printing_
Essentially: A commercial Berkey K&L platemaker, for a given neg, needs 4
minutes with pure palladium and up to 12 minutes with pure platinum. This
is using the same mercury vapor source, with the same operator and the same
paper.
In common parlance nowadays, *most* people refer to "platinum" while in
fact they are using mostly if not 100% palladium. Some people mean platinum
when they say platinum however.
Luis Nadeau
awef6t@mi.net
Fredericton, New Brunswick, Canada
..
>My tests were made using cyanotype and it is not beyond the realm of
>possibility that other processes would respond differently. However, the
>charts I've seen suggest ANY equivalence between BL bulbs & "regular"
>fluorescents would be highly unlikely....
>
>Judy