That's correct. I've just started spraying colloidal silver on my face after shaving a few days ago (I just like trying different things) and found it to be very effective against razor burns.
I quit shaving for years because of razor burn. When I started using colloidal silver, I found that spraying a mist on my face and neck directly after shaving stops razor burn before it even starts. I have been doing this for maybe 12 years and it never fails, no razor burn at all in that period.