Current interest for advice is germing old seeds.
1/2ml nitrozyme, per 4 cups of water, place seeds in small container (a pill bottle), pour a little of the nitrozyme solution in, place on a warm surface, (a cable box, or other warm surface), let soak for 24 hours, shake container at 12 hours, if any seeds sink, remove them, and place them in a wet paper towel (spring water, tap water only) placed in a ziplock bag left unzipped! Place ziplock bag on a warm surface, (a cable box, or other warm surface), check seeds for a tap-root tail every 24 hours.