Rodinal

Fresh Rodinal is a pale colour. A few days after opening the bottle, it begins to darken (even with the bottle tightly closed), and after two or three weeks it is quite dark. I have just discarded about half a bottle, three weeks after it was first opened, because of the colour change, as I was processing some important negatives. In fact, is the change normal? Agfa say that an opened bottle remains OK for six months - is this right?

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