Response to Rodinal Stock Solution

If you use less than 10 ml of Rodinal per 8x10 film unit you are gambling with your film development. Better to double the stock syrup than to cut back on it or live with the bare minimum recommended. One of these days you will have some important negs that aren't quite what they should be due to having not quite enough of the developer in the mix. Could happen as your local water company changes the mix of chlorine & additives or due to your film having more reduced silver than normal. But if it happens you get weak negs that would have been just fine if you had used good darkroom practice in the first place.

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