Breeding feminine seeds, non-hermi way

So these seed banks feminize there seeds, and it seems like the most secret thing in the world,
How do they do it?
Non hermi way,
I no the sts, and all that but how do these breeders do it,
If u nO and don't want every body to no,pm me plz,

Bump?.
Nobody no's

idk, but if u find out i want to know! post or pm me xP

the right hormones i believe...gerbric(probably butchered it but something that sounds similar to that) acid or something like that..