Response to Old photo chemicals

John, chances are your old bottle of metol is still good. However, since metol is quite cheap, I would not bother with it. Unless you can quantitatively measure its development properties against a known benchmark, you'll have no way of knowing if it's 100% functional, 90%, 80% .... I'm sure it will work, but that happens when you use it up and make a new batch from fresh chemicals? You'll have to do your tests all over again. It's not worth the trouble. I say, pitch it and buy new chemicals.

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