i have done it once successfully.
if you do a quick search you'll find out how to do it
How to Make Feminized Seeds with Colloidal Silver or Rodelization | Grow Weed Easy
How to Make Feminized Cannabis Seeds at Home | Grow Weed Easy
you have to spray it 2-4x a day daily for the first few weeks of flower (and some before flower but i didnt) and don't stop spraying it until its producing pollen already.
DONT GET IT ON YOUR PLANTS YOU SMOKE
im going to try a simpler way. using Silver thiosulfate solution
apparently you only have to spray the plant every 5 days for 30 days. so thats only 6x. using colloidal silver you have to spray it like 60x. i soaked my plant. whole plant. it was a mimosa evo fem clone. in a little little pot. i put her into flower and started spraying it 4x everyday for a month , give or take a few days.
i tried doing it with just a branch on different plants and failed. it only worked for me when i sprayed the whole plant. i was using 120ppm. and when i ran out i used my homemade 28ppm for last week of spraying but the homemade kind visually stressed the plant. the clear store bought kind did not hurt the plant at all.
but i have successfully made my own pollen from a female plant and then used that pollen to make my own seeds.
mimosa evo x strawberry pie auto (the only one i have growing out now)
M.E. x red hot cookies (not harvested seeds yet)
M.E. x orange sherbet auto (not harvested)
M.E. x gorilla cookies auto (not harvested)
they dont produce as much pollen as a normal male does. you can cut it with flour (baked) to spread it out.
its pretty easy.
my memory is bad but that is a little info for you and good luck.