What's the word to describe the act of darkening windows to disallow visibility from outside yet visibility from inside to outside is possible?
I was thinking of tinting, to tint a window, but visibility is still possible from a tinted window. In this case, the windows are darkened and visibility is completely impossible; all that you see from outside is a reflection of yourself, like in a mirror. You see these kinds of windows in places like hotels and offices. What's the word to describe the making of these windows and what are these windows called?