Response to 120 Ddge Density Problem.

This does sound like an agitation problem. Edge build up will establish itsef during the first 30 - 60 seconds of development. It can be caused by either too much or too little agitation. Not much help, I know, but you need to run a few test rolls and change your initial (first 30 seconds) agitation with each run and gage your results against each other. A pre-soak in water will sometimes help. But it should be noted that no manufacter recommends this and it will create a need for you to shorten your total development time.

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