It has been reported that inspectors have been telling facilities that they should replace some of their screens that they judged to be defective based on the use of the ultraviolet (UV) inspection light. Some of these screens have been returned by the facilities to the screen manufacturer for replacement. However, the screens are not defective, and the MQSA inspector is being blamed. Please do not use the UV light to check intensifying screens.
The UV light is a great tool to have in the darkroom to check for dust and lint. The particular light supplied to you has both short and relatively long UV wavelengths, and because of the short wave component, it can detect screen stains or surface imperfections in addition to dust and dirt. Although the instrument has the capability of showing surface imperfections, not all screen surface imperfections imply that the screen is defective. The only screen surface imperfections that warrant screen replacement are the ones that show up as film-based image artifacts. MQSA inspectors should use the UV inspection light ONLY for the isolation of dust and dirt in the darkroom.