Response to Pinakryptol yellow in FX-2

The amount of pinaktriptol yellow (a former AGFA brand name for the dye) stated in the receipe is by far not enough to desensitize the film enough to make it possible to develop by inspection. On the other hand: By blocking the long red wavelengh you might get sharper images. Red is a real problem in photography, in colour and B&W and many different approaches have been found to compensate for example for the focus shifts that occur in the lens and on the film. The idea by Goeff Crawley could have been to desensitize the red spectrum enough so that the dominating blue spectrum could be recorded with maximum acutance without interference from the red wavelength. This would have to be tested.

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