Resin fixed colloidal crystal sheet, method for displaying structural color using the same, method for detecting unevenness distribution or hardness distribution of a test article using the same, and structural color sheet

摘要

A resin-fixed colloidal crystal sheet which has a strong structural color and makes it easy to observe the structural color even from a direction directly facing the surface, and to provide a use thereof. The resin-immobilized colloidal crystal sheet according to the present invention includes a plurality of crystal domains in which colloidal particles are fixed in a resin, and in backward reflection spectrum measurement on the sheet surface of the resin-fixed colloidal crystal sheet, Bragg attributable to a plurality of crystal domains The intensity of reflection satisfies the following conditions (1) and (2). (1) the elevation angle from the seat surface is in the range of 60 degrees or more and less than 90 degrees, and when measured on a predetermined azimuth angle of the seat surface, it is not 0 and (2) the elevation angle from the seat surface is 60 degrees or more Is less than 90 degrees and has a maximum value at a predetermined azimuth angle when measured on the azimuth angle dependence of the sheet surface.