photochromic


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photochromic

Materials that change their ability to reflect color when exposed to light are called photochromic, and the color change is proportional to their level of UV light absorption. This results in reversible color reflections. When the light source is terminated, the material changes back to a clear state. See also: Smart materials
References in periodicals archive ?
Writing is easily accomplished by exposing a photochromic material to focused spots of light appropriate to induce the photochromic reaction that changes the colour of the compounds at the storage site.
Additionally, photochromic fluorescent proteins may be useful for optical data processing, optical and biological switches, holography, information processing, nonlinear optics, and in light sensors.
For example, photochromic and thermochromic systems are passive, chemical-reaction, smartglass technologies that respond to light and temperature change respectively.
Of particular excitement during the 1997 selling season has been the introduction of the mass market priced Sensor-X sunglass line, a photochromic (color-changing) optical glass lens using Corning sun sensor XDF lens technology.
Yet there will be sustainable innovations in building: photochromic glass for example will soon perhaps be cheap enough to use on a large scale; electrochromic glass[10] is very expensive now, but will presumably become cheaper.
The extra cost of photochromic lenses can be worth the expense since they do away with the need for two pairs of specs.
Vermeulen and Thompson have also made a more photochromic version of the material.
They propose embedding so-called photochromic chemicals, which change color when briefly illuminated, inside transparent plastic cubes and using lasers to record data as tiny colored and uncolored dots in the cube, creating a binary code.
The PhD 2.0 NXT Sun lens features Serengeti 3-in-1 lens technology: polarisation, spectral control and photochromic technologies.
The first of these is a set of rings that utilizes the photochromic technology of Mitsui Chemicals SunSensors to change color in sunlight; the second is a transparent flower vase made from Mitsui Chemicals STABiO series of bio-based polyurethane material that makes water look as if it is floating in midair.
' Of course we recall that their spontaneous reaction to the loss then was the illogical claim of 'photochromic' ballot paper that ensured that when APC was voted for, it will turn to a vote for PDP, such as the classical falsehood that governs the APC.
Acuvue Oasys achieves the darkening effect through a light-sensitive dynamic photochromic filter developed by Transitions.