I believe Ultrastable uses a diazo based sensitizer. Unfortunately I
can find in my notes no written confirmation so I suspect
this information must have been related in a conversation with
someone at EverColor who explained that one of the major reasons
for going to the silver bromide pigmented emulsions was because of
an approximatley 100:1 gain in speed over diazo sensitizers. I
assumed that comment to be a reference to the Ultrstable materials
EverColor had been making under the old company name, Color Prints
by Nordstrom.
Does anyone on the list have any expereince using diazo sensitizers for
carbon (or gum, direct carbon)?
Sandy King