Around 1993 I made about half gallon of PMK stock solution. They have been stored in photo chemical approved plastic (I think HDPE) bottles and now wish I had used glass bottles instead. I last used the developer in 1998 and it worked fine. Now that I'm slowly getting back into photography, I got to wondering what the shelf life of the stock PMK solution is. Quite awhile back Gordon Hutchings told me it would last many years. But how many years?
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