When visiting toilets, bathrooms, hotel rooms, change rooms or bedrooms, how do you know for sure that the seemingly ordinary mirror hanging on the wall is a real mirror, or a 2-way mirror (i.e. that someone can see you, but you can’t see
them)? It is very difficult to positively identify the surface by just looking at it.
So, how do you determine what type of mirror you're looking at?
CONDUCT THIS SIMPLE TEST: 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 a GENUINE mirror. However, if your fingernail DIRECTLY TOUCHES the image of your nail, then BEWARE, IT IS A 2-WAY MIRROR!
Why is there a gap? On a real mirror, the silver is on the back of the mirror -
UNDER the glass. With a two-way mirror, the silver is on the surface.
So remember, every time you see a mirror, do the “fingernail test.”
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