Photochromic Pigment, which refers to the excitation of a specific wavelength of light irradiation, as the change of absorption spectrum, the color of the material or the light absorption characteristics of dynamic change, can be said to be one color reversible changes in substance.
As early as 1881, a British chemist t. H.P hipson published an article, introduces a kind of coating coated on the glass door of the post office, when the strong sunlight, glass door automatically become black, when the solar radiation, the door automatically turned white, this is a kind of coating lithopone (zinc sulfate and barium sulfate mixture), the color change is due to the role of lithopone. Later, in 1899, W.M atekwald found, is not only the inorganic substances, and some organic matter also has the Photochromic Pigment discoloration, is not only a solid, but also have some liquid Photochromic Pigment discoloration, and has a reversible photochemical change material, entitled to light materials.
In 1950, y. Hirshberg eventually put on has a reversible color change materials as the photosensitive color material. A, photosensitive discoloration Photosensitive discoloration, simply is due to the effect of radiation, the use of photochemical reaction substance, the reversible color change phenomenon. The following type: hv - A (,) B (2) she's well hvZ A matter is by the radiant energy HVL into B, and B under other radiant energy hv: able to return to A reversible, in here,, 2 respectively into A substance and B absorption .
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