One of my main complaints about the way Kodak packages its chemistry these days is that they have eliminated the smaller volumes. I can only get Dektol in a one gallon size and, since I don't do a lot of printing, I end up throwing out half the batch I mixed up.

I'm thinking about going back to mixing my own Dektol and D-76 from scratch in one litre sizes. I used to do this years ago and have scale, etc. I also have a supply of chemicals that are at least 25 years old, such as Hydroquinone, Elon etc.

Here's my question: Would anyone care to hazard a guess about the shelf life of these chemicals? They've been kept cool and dry but I'm wondering if and how age can affect them. Should I toss them and start fresh?