How To Determine A Two Way Mirror

How to Determine a 2-way mirror?

While changing clothes in Hotels and textile showrooms, it is very important to make sure that the mirror is not a two way.

Have you seen recent advertisement of M/S SAINT GOBAIN GLASSES shown in Television? If yes then you must have known about 2 Way mirror.

Not to scare you, but to make sure that you aware. Some of the hotels and textile showrooms cheat the customers this way and watch privately.

How to determine if a mirror is 2 way or not?

When we 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, are actually a 2-way mirror i.e., they can see you, but you can't see them. There have been many cases of people installing 2-way mirrors in female changing rooms or bathroom or bedrooms.

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


Test 1: 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!(there may be someone seeing you from the other side). So remember, every time you see a mirror,do the "fingernail test." It doesn't cost you anything.

It is simple to do. This is a really good thing to do. The reason there is a gap on a real mirror, is because the silver is on the back of the mirror UNDER the glass. Whereas with a two-way mirror,the silver is on the Surface.

Test 2: This from William Beaty, electrical engineer, Seattle: "... simply turn the lights off in [the] room, then place a bright flashlight against the mirror surface. If there is a hidden chamber behind the mirror, the flashlight will illuminate it, and since you're in a darkened room, you'll see the hidden chamber."

A deputy from the Washington County Police Department in Oregon concurs, and suggests that even a pen-light will work for this test, though not nearly as well. He further suggests that, if you are in a room (such as a changing room) where you cannot turn off the lights on your side, if you hold your eyes near to the glass surface and cup your hands around them on either side to eliminate most of the light from your visual field, you ought to be able to see through the treated glass, as Mirropane will permit about a 12 percent passage of light (from the lit side to the hidden chamber, if there is one).

Douglas Brown, a part-time field researcher and writer who also works for Powell's Books, Inc. in Portland, Oregon, has some clever advice to share. He makes the point that there is a clear auditory difference between Mirropane and regular mirrors, because of how they are installed. Rap on the surface with your knuckle or fingernail, he says, and in most situations you'll be able to hear the difference in the sound produced. Ordinary mirrors have backing material which will dull the sound, while windows have open air behind them and will reverberate more.

Keep it in mind! Make sure and check every time you enter in hotel rooms.May be someone is making a film on you.

Please share this information with your friends, family and all.

Comments 1 comment

Dan 7 years ago

This test is false. Go to for an explanation. The best way to detect a two-way mirror is:

a) determine if it's mounted flush with the wall or *on* the wall. If the latter, it is most likely a standard mirror.

b) tap on it. regular mirrors with mounting material behind it will make a dull sound. Mirrors with camera portals or other hollowed out areas behind, will sound hollow.

c) take a flash light or laser pointer and press it against the mirror. If you can see the light beam passing through, it's a false mirror.

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