A Mirror or a 2-Way Glass?

How can you tell when you are in a room, restroom, motel etc. whether the mirror on the wall is a real mirror or a 2 way mirror?

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When you visit toilets, bathrooms, hotel rooms, changing rooms, etc., how many of you know for sure that the seemingly ordinary mirror hanging on the wall is a real mirror?

It is very difficult to positively identify the surface by looking at it. So, how do we determine what type of mirror it is?

Place the tip of your fingernail against the reflective surface and if there is a GAP between your fingernail and the image of the nail, then it is GENUINE mirror.
However, if your fingernail DIRECTLY TOUCHES the image of your nail, then BEWARE! IT IS A 2-WAY MIRROR! 

So remember, every time you see a mirror, do the “fingernail test.

REMEMBER “No Space, Leave the Place”

Thanks to my fiend Ufuk Onen