I need some advice from you seasoned darkroom guys. I've looked through these threads and can't find anything.

While cleaning in the garage, I discovered a box with packages of Kodak Dektol, Fixer and various other developers. Some of the packets have expiration dates in 2007 and 2009 and others don't have any dates.

The ones with dates are a heavy plastic material and others have the paper feel with the foil inside.

Question is, are they usable or should they all be discarded?

I didn't think dry chemistry ever turned bad.

Please help and thanks.