Somebody gave me some old b&w chemistry (he, in turn, got them from somebody else, and does not know how old they are). To give you the idea, one of the bottles has a price tag of CAD$3.99; the same bottle from the same store costs CAD$17.99 today. I have the following items on my hands, and I wonder if any of them are still usable. 1. An unopened bottle of Ilford Rapid Fixer (still sealed under the screw-on cap). 2. Agfa multigrade paper developer. The bottle is opened, and about 1/5 of the stock solution is used. 3. A pack of Kodak D-76 powder. I could not find expiration date on either of them. Does this mean that I can still use them? Many thanks in advance for any input.