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Spy mirror coating on Glass "One-Way-Mirror"

Special Properties

  • Transparency depends on lighting conditions
  • Reflectance approx. 60 %
  • Transmittance approx. 3-4 %
  • RoHS compliant
  • Good moisture resistance
  • Condensation resistant

Typical Applications

  • Spy Mirror
  • "One-way mirror"
  • Mirror attachment for security surveillance
    video camera
  • Hidden observation window
  • Mirror for environments with high humidity
  • Hidden animal observation

A so-called spy mirror allows to observe a bright room from a dark room. At the same time it is impossible to view from the lit room into the dark room. In the bright room, only a mirror reflection can be seen, so the observer cannot be discovered. Due to this effect, such a spy mirror is also called a one-way mirror. This one-way effect, however, is solely based on the light contrast between the two sides of the mirror, because a mirror that is transparent only from one side is not possible for physical reasons. So it is imperative for the desired function of a spy mirror, that the lighting conditions between the region to be observed and the area from which it is observed differ significantly. The observed space should be be illuminated as light as possible, while the dark observation room remains as dark as possible for best results. Our TDS spy mirror is also often used to hide surveillance video camera equipment. This works based on the same principle of different lighting conditions in front of and behind the mirror, as described before. The camera should be sensitive enough in order to deliver a bright picture.

The coating of our TDS mirrors is a partially transparent chrome coating, having only a small rest transmittance. It is corrosion resistant and highly resistant to water, acids and other environmental influences and it is RoHS compliant. The coated side of the spy mirror should point towards the bright room. At adequate quantities, for safety relevant areas, a thermal strengthening of the spy mirror is possible. As well, at large purchase quantities, other optical rest-transmissions and other glass thicknesses are available. Please send us your requirements in such cases.


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Optical properties

  • Average transmittance in the visible ca. 3-4 %
  • Reflectance approximately 60 %

Product code

  • TDS Spy Mirror



  • Single side chrome mirror coating (RoHS compliant)

Standard Thickness


All given details and specifications are mean reference values and are not guaranteed. In addition, please consider our "Notes on technical specifications"