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Conventional inorganic photochromic (PC) anti‐counterfeiting material generally require time‐consuming identification of information or response to changes in display information, resulting in low‐level readout and decoding efficiency. In this study, a new type of inorganic PC self‐bleaching material, i.e., rare‐earth‐ion‐doped Bi1.5ZnNb1.5O7 (BZN) ceramic and corresponding mono‐/bi‐crystalline‐phase...