Just experimented with Pyrocat HD 3:3:600 ml dilution on Classic 200 rated at 200, for 6 mins and 12 mins. Result: barely discernible rendition of the scene. For all intensive purposes the scene, which had an SBR=9, did not develop. All I got was very close to clear film. Can anyone explain whether such dilutions are too weak or that my times were too short?