Some time ago I bought an old Kodak C-22 processing kit,the 1 pint size. Intent is to use it to redevelop a roll of C-22 I took 45 years ago and processed some years ago as B&W. I read in Kodak Publication AE-31 that you can just bleach the film in fresh E-6 bleach, re-expose the silver halides, and process as color. So the first question is whether the chemistry in the C-22 kit has any chance of being good. Will part A of the developer (contains 4-amino-N-ethyl-N-(β-methane sulfonamido-ethyl)-m-toluidine sesquisulfate monohydrate) still be good? (I presume this is a form of CD-3.) Will part C of the developer (contains benzyl alcohol) still be good? That bottle is still liquid. The bottle of part B of the hardener appears to contain a brown powder at this time, the caution label says it contained formaldehyde and methanol. Has that gone bad? The next question is what parts of the process need to use C-22 chemistry? Obviously the developer. I presume I can use any stop bath. Do I need to use that C-22 hardener, or would Flexicolor Stabilizer III have enough formaldehyde to harden the emulsion? I presume any rapid fixer will do. From a posting by Ron Mowrey, I see that I have to use the C-22 ferricyanide bleach to transform the lueco dyes to their final form.