Colloidal silver is used to make a female plant grow male flowers.
Since the pollen from these male flowers is produced by a female plant, the pollen only has female chromosomes.
This pollen when used to fertilize pure female flowers will produce "feminised" seeds, since there are no male chromosomes present anywhere through the process.
Colloidal silver does not and will not cause female calyxes to become fertilized on its own.
You need to grow male flowers on a female plant and use the pollen from those male flowers to fertilize the female flowers to make seeds.
Be aware too, it is not recommended to consume any plant treated with colloidal silver or sodium thiosulphate, which is another chemical that is used to initiate male flower formation on pure female plants.
Generally when producing male flowers this way, the pollen is used on the next crop of plants, as by the time the females grow the male flowers, they will be too old to fertilize them and still have enough life in them to mature the seeds properly, as seeds take 4-6 weeks to mature.
Hope this helps, Organoman.