I purchased a fridge full of b/w and Cibachrome paper some time ago for $20. Most is OLD ('40s through '60s) and fogged a few stops, and I have been having some fun with it here and there when I get the time. Among it is: 100 sheet box 8x10 AZO F-2 single weight 250 sheet box 8-1/2x11 AZO E-4 single weight The problem is that a lot of this paper is obviously stored in the wrong boxes. How do I know if this really is AZO? I ask because I know some people have a special affinity for this particular paper, while I have not developed one, and DO NOT want to develop one, since the stuff isn't made any more. If it is AZO, I want to give it to someone who will really appreciate it in applications where fogged paper won't hurt the image. Thank you in advance.