With regard to the present dicussion on light sources for printing, I
wonder whether the following observation would be of interest.
Recently I acquired a Bruning 70 desktop Dyeline photoprint machine.
Briefly, the exposure section of the Bruning 70 consists of six
flourescent UV tube mounted inside a glass clylinder which rotates
around them.
The sensitised diazo material and the original are conveyed around the
glass cylinder during exposure, by means of woven nylon belts. These
hold the original and sensitised material in tight contact with the
glass cylinder. The lamps and cylinder are cooleed by an internal
blower.
The length of exposure is varied by altering the rotational speed of the
cylinder.
I haven't had much chance to play with the machine, but it does seem to
be a quite useful and convenient means of printing Cyanotypes and Gum
bichromate systems, and I would suspect that it would work quite well
for Carbon printing and Kallitypes etc.
Has anyone tried using a diazo print machine as a source of UV?
As the Dyeline process is being rapidly displaced by large photocopiers
and inkjet printers, it should be possible to pick up a small diazo
printer quite cheaply.
Alex.
Alex Nanson
Gloucester UK