| http://www.w3.org/ns/prov#value | - Another item not obvious to a person of ordinary skill in the art, prior to being apprised of this invention, is that it is not necessary, in order to obtain sufficient energy absorption to get the liquid-crystal film to change color, to use an amount of dye or other sensitizing material so great that there would be other difficulties, such as having the color of the dye mask any changes in the co
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