Recently, some netizens broke the news that a bar in Guangzhou is equipped with double-sided mirrors in the bathroom, and the scene of the mirror can be clearly seen in the box. The person in charge of the bar explained that the mirror faces the wash stand, which belongs to the public area and has no risk of privacy exposure, but in order to protect the consumer's right to know, the bar has currently pasted a prompt sign on both sides of the mirror to remind consumers that the mirror is a double-sided mirror.
On March 18, the staff in charge of market supervision in Guangzhou gave feedback to the Xiaoxiang Morning News reporter that the bar involved had been rectified and closed the mirror in the box, and the person in charge of the bar also confirmed the matter.
Whether the widespread use of "double-sided mirrors" is compliant
In response to this matter, the reporter consulted the staff engaged in glass production and installation, he said that the mirrors on the market are ordinary single-sided mirrors and single lenses, "single lenses are what everyone calls double-sided mirrors, on the one hand is an ordinary mirror, reflecting the mirror; on the other hand, through the mirror you can see the outside scene." The staff member stressed that at present, most of the single lenses that come to purchase are public units, and the police station uses more.
The reporter searched for "double-sided mirror" in Baidu entries and learned that the two-way mirror, also known as single-sided see-through glass, is made of vacuum coating on ordinary glass with a layer of metal chrome, aluminum or iridium film. This glass reflects most of the light projected back. This kind of glass is attached to the car, and the person sitting in the car can clearly see the outside, but the person outside the car cannot see everything inside the car. The product is widely used in prisons, interrogation rooms of public procuratorial and legal institutions, psychiatric hospitals, research rooms of university scientific research institutions, large conference rooms, etc.
How to tell if a mirror is "normal"
The incident has attracted public attention, and many people are thinking about how to simply distinguish whether a mirror is "normal" or not. There are popular science articles that introduce that the finger is touched to the mirror, and if there is a gap between the mirror and the finger, it indicates that it is a normal mirror; if there is no gap between the mirror and the finger, it indicates that it is a single lens.
However, some physicists remind that this statement does not apply to all two-way mirrors, as long as a layer of glass is added in front of the two-way mirror, or the "sandwich" is coated in the middle of the glass, the "finger method" does not work. According to the guidelines for the use of the "two-way mirror", the observed person must be in a very bright environment, and the person behind the mirror is in the dark place, in order to achieve the effect of "voyeurism". Therefore, compared with the "finger method", the more effective way to judge is: turn off all the lights, use the flashlight against the mirror, or stick the eyes to the mirror, block the light with both hands, and carefully see if there is anything behind the glass mirror.
【Related Reports】
The network rumors that the double-sided mirror of a bar in Guangzhou can see the toilet in the box, and the person in charge of the bar said that what can be seen is the hand washing station
A follow-up to the double-sided mirror incident in a bar in Guangzhou: the store posted a prompt sign on both sides of the mirror, indicating that it gave consumers full right to know
Xiaoxiang Morning News reporter Ou Qiaoyu