Re: BL light box 'blues'
Pyro negs, as well as Tmax 100 film, do not work for UV processes...the
other problem I had with this mysterious long exposure thingy with students
was UV blocking glass in the contact frames. Third, in the winter with
really low humidity I find that my exposure time is affected. But with BL
bulbs even with my longest exposure with 1A:1B it is 24 minutes; 2A:1B is
half that. Longest exposure, on Fabriano AEW paper which hates cyano...
PS SO fun being in Dallas and had dinner with Eric Neilsen, Melody Bostick,
and Tillman Crane--Jeremy Moore where were you?????? We had FUN shootin'
the breeze about photo!
----- Original Message -----
From: "Ken Sinclair" <email@example.com>
Sent: Monday, March 30, 2009 3:48 PM
Subject: BL light box 'blues'
Have recently decided to intensify my interest in non-silver, I
new UV light-box using 10 BL tubes presently 5 inches above my printing
So that I could use the same negatives for both silver-gelatin, Cyanos
I switched to Pyrocat as a developer... and I must admit, they do look
A few years ago my southern Alberta summer sunlight exposures for Cyanos
running around the eight minute mark... which expanded to around two and
hours in the rather weak December sun.
The exposure times I expected using the new 24" BL tubes are nowhere as
short as I had
hoped... Cyanotypes seem to be requiring around 40 to 50 minutes while I
yet reached the 'end-point' for acceptable VDB exposures, it seems as if
60 -70 minutes
might be the absolute minimum.
I do not have a stouffer wedge to assist reaching my standard exposure
times, my patience is
wearing (as my frustration level rises).
I have just put a VDB out on the deck to enjoy some natural UV rays from
for a time comparison...
Are my BL light-box test exposure times "out of line" with times
experienced by others?
Quando omni flunkus moritati (R. Green)