If you're saying that the slides made from the negatives were faded, then that has to do with the copy film, not the 5247 per se. I've heard the same thing about slides from ECN-2 films made in the 1970s; however, I've got a few rolls of ECN-2 film for which I had slides made in the mid-1980s, and those slides are fine (or were a few months ago, when I last examined them). My understanding is that there were massive improvements in the copy film made sometime in the late 1970s or early 1980s, but I don't remember the details. I hope you've still got the original negatives; those would produce better prints than the slides, anyhow, since the slides are copies. (At least, assuming you don't want a special "look," such as that produced by Ilfochrome.)