Here's my germination method. Though I havent tried this with really old seeds but it works with seeds freshly harvested. My germination rate is 100%
First lets examine the morphology of cannabis seed
View attachment 4348046
If you look at the cutaway...the root cap and cotyledons meet at the pointy end of the seeds. IMO, the pointy end of the seed determine the germination/dormancy of the seed. Some seeds just have really thick pointy end, some are thinner. The pointy end hold the seed together. If the pointy end doesnt open, the seed will not germinate. Needless to say, we want the pointy end to open to let the root cap come out (germinate)
1. The crush test...by pressing the seed between your fingers. If it crushed, its no good. If it stay intact, you have a good seed.
2. File off the tip of the seed....that's right folks...by filing off the tip of the seed, you remove the glue/lock/dormancy (figuratively speaking) of the seed, hence it makes it easier for the seed to open. Using emery board (if you dont know what this is....ask your wife/girlfriend) file off the tip of the seed until you break through the perianth. It would only take a few stroke of the emery board to break through, so be careful.
Correct way to file off the tip
View attachment 4348072
Wrong way to file off the tip
View attachment 4348073
If you see white stuff, you went too deep and most likely you have damaged the root cap or cotyledon. Surprisingly though, this will still germinate but the growth would be funky. So try to avoid filing too deep.
3. The soak test and beginning of germination.... drop the seeds in water. Any seed that doesnt sink in a couple of hours is no good (some may take a bit of push to sink). In 24 hrs, the root caps will start to emerge.
View attachment 4348076
4. At this point, the seeds can be directly planted in your favorite medium or finish it in paper towels or however you plant your seeds. Once the root cap is out...it's ready to grow.
This technique is an old technique, it is use in germinating hard shell fruit seeds.
If you dont believe it, try it in one seed, 24 hrs you will see root.
I've been using this method for several grow now, I havent have a single seed failed to germinate.