Two way mirror effect with window film

This week's tip is from ShadyLady ~
Two way mirror effect:
I had a set of sliding windows in an office that needed one way glass, used silver 20 then put HP6 over it worked great...I have done it on banks, dr's offices, ect... If you have time in the shop someday mess around with a few different films and you will see what I mean, they work pretty good...