Let's see some prints of shiny chrome objects (like motorcycle engines) which have had the recommended "safelight test" performed on them. It's the degraded highlights that these safelight tests are designed to reveal. The tests are best when you can see side-by-side comparisons with extremes of exposure time. I would more likely believe a safelight safety declaration that suggested the safelight might be safe "for 15 minutes at 4 feet from the paper"
When you can see one side of the print that had safelight exposure looks just as good as the side that didn't have safelight exposure - then you can declare the safelight is safe for that paper from that distance for that amount of time. I would look - in earnest - for the time when it is not safe. Then I would make sure the paper is only under safelight exposure for less than that amount of time.
Re-reading, you have given a reasonable guideline: 5 minutes at 1 foot... Let's see what that does to a picture of shiny objects!
Last edited by Bill Burk; 06-13-2013 at 08:08 PM. Click to view previous post history.