Yesterday I just mixed up a can of 2 part D76 that I think was from the late 40s early 50s and used it to develop a couple sheets of Fomapan 100. It worked great. You'd never know it was as old as it was. It had a little 2" tall cardboard oatmeal box style package above the off white crystals. The can opened with one of those twist keys that was attached to the bottom of the can.