Re: BFK Rives & UV sensitive processes
Tom Ferguson (tomf2468@pipeline.com)
Tue, 17 Dec 1996 01:00:53 GMT
Hello Kevin (and others),
I think you have a problem here. I too added a fan to my "UV tubes"
light system (seemed to make gum printing a LOT more repeatable). But... 2
hour or 30 minutes seems quite excessive. IF.. you are using UV "bug"
lights, I find 2 to 8 minutes more typical. My fans are right in the walls
of my exposure unit??
tomf2468@pipeline.com
>Dear all,
<SNIP> >One other observation, based on this weekend's debacle: Unexposed
>cyanotype chemistry is apparently very sensitive to heat. My new,
primitive >lightbox was taking up to two hours to expose prints, until I
stuck a fan >nearby to cool the tubes. Exposure times dropped to 20-30
minutes.<SNIP>
> Kevin