I've been feminizing plants with colloidal silver lately, to save up pollen for 7 different varieties of auto-flower feminized seeds I bought. I've got nearly a gram of pollen for every one now. But what a bunch of work to keep it all separate!
I finally realized, there's NO REASON TO SAVE POLLEN!!!! It's just TOO EASY to make pollen from female plants, fresh when you need it.
When you want seeds, just grow one nice female seed you bought from a reputable seed seller, and spray one branch near the bottom (or 2 if you're paranoid) using colloidal silver methods. Mark the one with a ribbon, some people say you can't smoke that part (seems dubious to me). But the rest of the plant will not be sprayed, and you can smoke it after you extract seeds from it.
Alternately, spray the new growth on the top of the whole plant. Don't go down into the inbetweens and spray that, you want the inbetweens to grow flowers. Let the top grow male pods. The only drawback with this method is, all got sprayed a little, so none is smokable. But you'll get so much pollen, you won't have any doubts about it. Swat it with your hand, and it'll raise a yellow dust cloud that will make you cough.
You'll get male pods from the colloidal silver a little before, or about the same time the rest has female hairs. Then, just move it to a room where it can be alone with itself, maybe slightly enclosed but with light above, a mild fan to set the mood, and some Berry Manilow music.
You'll get a ton of seeds that are all presumably F1 clones of the original (barring gamma and cosmic ray DNA degradation).
You only need to spray until you see the beginnings of male pods. The biggest mistake I made was spraying 3 times a day, keeping it up until I saw some pollen. That stunted the growth of the male pods on my AK47 (which did in fact produce pollen a month later, after I stopped spraying it too much). Also, it's a little too late to spray if you already see flowers. It'll still work, but it's much cleaner if you spray just before it shows any tendencies. It's the spurts of fine new growth that you want. If you spray that, the new growth will be ALL male, without confusing flowers mixed in.