Select the unit output closest to the number given by your flash manufacturer. Then find the guide number for feet or metres. Handle unprocessed film in total darkness. Darkrooms must block all infrared radiation as well as light. Painted windows, plastic sheeting, etc., though opaque, may freely transmit infrared radiation and fog this film.
Infrared films are susceptible to static markings at low relative humidity.
Handle with care in the darkroom. If static electricity problems persist, grounding the camera may be necessary during loading and unloading to avoid a buildup of static electricity. The various pictorial, scientific, and technical applications of this film may require negatives of different contrast indexes. The following starting-point recommendations are intended to produce a contrast index close to that listed in the table. Make tests to determine the best development time for your application.