35mm film canister or other air tight opaqe container in the fridge for 3 months.
fridge or freezer and do you mean opaqe or none opaqe i think you mean none transparant but i could be wrong please use smaller words and more detail : i think opaqe means see through but most film canister that i know of are black and when you close the fridge door the lights go off anyways
and instead of harvesting the pollin could i just leave it in the pollin sacs and put them in the container, like just cut the hole sac off the plant leaveing the pollin in it. then put the sacs in a canister whole then put that in the freezer would this work dortor freeze sperm all the time for years