i use the patterson tank system for developing b&w film. the patterson tank calls for using 290ml for each reel of 35mm film to be developed. i was reading in the film developing cookbook, to use 250ml for each reel. so, if im using kodak d76 1:1. that would be 500ml for each reel. thats 210ml more developer. i just wanted to know if any of you use 500ml of developer and do you see any difference? ill try it out but i just wanted to know if you saw any difference. thanks.