I've used much older stock and been fine. Expose at 25 ISO and Dev in Technidol unless you are wanting some special effect. For copy negs, expose at 12 ISO and knock a minute off the dev time. I find it likes longer fixing than advertised. If you haven't processed it before, it is on a special thin base that can be a pig to get onto tank spirals. Just be patient. You get there in the end.