The chemistry necessary for the extremely fine grain image was difficult to control and coat and get uniform results from batch to batch. It also varied in keeping characteristics even when refrigerated or frozen.Originally Posted by roteague
Even now, you can get some that has kept well, and some that appears to have very high grain due to a unique keeping problem related to this manufacturing problem. So, buyer beware. Some old Ektar 25 may be good and some may be bad.
The stuff that goes bad, is VERY bad.