ANY female cannabis plant under severe stress will throw-out nanners. That is your goal. If you start with stable genetics and fem correctly...you will still have a stable strain. Do it wrong, and there's no going back...the damage has been done.

Stamen It is collodial silver...can Google the process of making your own.

Uncoated aspirin (salicylic acid) works.

GA (gibrellic acid) has been used for many years in the agriculture industry to make seedless grapes and other genetic mutants. It also stresses a cannabis female into throwing-off nanners from which femmed pollen is taken and applied to another female. (donor is killed, as the application of the gibrellic acid renders it potentially toxic to humans) The Dutch have been using this crap for decades on cannabis.

The above products plus the benign methods of light stress, heat stress, cold stress...all are stressors that induce the (100% natural) imbeded self-preservation traits that force the nanners in an effort to self-pollinate and continue the species. Any one of the stressors (if done properly) works to make femmed pollen.

If you know what you are doing, you can have great success. But if trying this before you know your plants, you can easily ruin your present grow, and if things go real bad...might screw-up your own seed stock.