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Message: <blockquote data-quote="wsvperera" data-source="post: 3260228" data-attributes="member: 14935">Steps   1. Observe how the mirror is installed. A normal mirror is hung against the wall, but an observation mirror is set into the wall. If the wall is behind the mirror, it's probably a normal mirror.   2. Turn off the lights and hold a flashlight or even a small personal flashlight to the mirror. If it is a two-way mirror, the room on the other side will be illuminated.   3. Press your eyes against the mirror and cup them with your hands, creating a dark "tunnel" to block out the light. When you do so, the light in the observation room will be brighter than the light on your side of the mirror, and you should be able to see something beyond the glass.   4. Tap on the surface of the mirror with your knuckle. A normal mirror will produce a dull sound because it is placed in front of a wall. A two-way mirror, however, will produce an open, hollow, and reverberating sound, because there is an open space on the other side.Tips    * The "fingernail" test most commonly associated with identifying two-way mirrors is not as reliable as any of the methods above. It can be performed by putting your fingernail against the mirror. If there is NO gap between your nail and the reflection, you are touching a first-surface mirror. These are quite expensive and would not be installed under ordinary circumstances. All observation mirrors are first surface mirrors, but not all first surface mirrors are observation mirrors.    * Some places, such as gas stations will use one way metal mirrors because glass mirrors can be destroyed by users.WarningsNo test for a two-way mirror is foolproof. There only needs to be a very small opening in the wall for a hidden camera with a fisheye lens, and there won't be any giveaway illumination on the other side, or any hollow sound, or anything to see with your cupped hands. Even if the mirror is a normal one, there are many other places to hide observation devices. Also keep in mind that most people have no desire to go through the risk, trouble and effort to spy. An exception to this would be the proprietors of retail establishments, who often use surveillance technology in order to hold down employee theft as well as shoplifting.</blockquote>

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