Fogging from computer monitor?

Discussion in 'Alternative Processes' started by colrehogan, Jan 3, 2006.

  1. colrehogan

    colrehogan Member

    May 11, 2004
    St. Louis, M
    Large Format Pan
    Is it possible that the light from a computer monitor could cause fogging of a newly coated/dried pt/pd paper? I was coating on my desk last night and thought that some of the prints looked different than they should. Before printing the last print, I thought about this and turned off the monitor. My coating surface is about a foot away from my monitor.
  2. Michael Mutmansky

    Michael Mutmansky Member

    Sep 7, 2002
    ULarge Format

    Sure, it's possible. The phosphors in a picture tube are not entirely unlike those in a fluorescent lamp. However, the amount of light coming from the tube is very small, and it likely that a very strong portion is well out of range for pt/pd. If you left a sheet in front of one for an hour, I expect it would fog a bit.

    You can try a fog test to see if it does. Cover a portion of a strip of coated paper with some cardboard or rubylith to use as a control and leave it for 30 minutes or so. Run it through the developer, and then clear it. It should be apparent if the light causes any fogging when you clear it, as the control area should clear completly, assuming you have fresh FO. The exposed area will show up as a faint graying of the paper in the coated area. Make sure you look at it in good room light to see if there is any fogging.