Quote Originally Posted by Gerald C Koch View Post
The film is sensitized for the output of the phosphor screen. This sensitization may be for only a very narrow band of the green spectrum. Still this film was never intended for exposure with continuous visible light spectra. At the very best colors other than blue and green are going to register as black.
The data sheet published by Kodak for its green sensitive X-ray film describes it as orthochromatic. They use that exact word. The data sheet also has a spectral response curve. It looks much like the response curve for orthochromatic films. I understand this thread is about Fuji film, not Kodak, but users at the LF forum have reported similar results. I expose Kodak green X-ray film through a yellow #11 filter and get results similar to black and white negative film, except light greens are brighter, and reds are dark, but overall tonality is similar.