On Jul 27, 2008, at 8:51:32 AM, "Christina Z. Anderson" <zphoto@montana.net> wrote:
Hi Brian, I coat under full on tungsten light (probably a 100 watt bulb in the ceiling fixture) for cyanotype, gum, platinum. I **dry** prints, though, in a closet and generally turn the light off when leaving the room to let the prints dry. BUT I generally do not do this with either Van Dyke Brown or Salt as both are more prone to fogging and are silver processes. So it depends on what your process of choice is. I used to use yellow bug lights but found this very difficult with some processes including yellow dichromate, and when I found out that Laura Gilpin of historic fame coated her pt/pd prints in daylight I thought what the heck.
I also eyeball register over a light box that has fluorescent tubes in it with nary a problem, but the light from that has to go through thick plastic and the back of the paper to fog a print and it isn't on the lightbox long enough to matter.
You could always do a test: keep a coated print out, and cover all but a strip with a black photo bag. Every 5 minutes move it an inch. Develop and see if you have stripes.
With many processes that take long exposures it just isn't a problem. Chris