Owing　to　the　difficulty　in　replication　and　high　security,　delayed　anti-counterfeiting　is　an　emerging　technology　for　its　applicability　in　encrypting　high-precision　devices.　Materials　with　photochromic　(PC)　effects　and　self-recovery　behavior　are　appropriate　candidates　for　realizing　delayed　anti-counterfeiting.　Herein,　Dy3+-doped　(K0.5Na0.5)NbO3-based　ceramics　were　designed　and　prepared　via　tape-casting　method.　Down-conversion　photoluminescence　with　white　emission,　conspicuous　PC　reaction　and　dynamic　PC　self-bleaching　process　were　observed　in　the　ceramics.　The　concentrations　and　positions　of　different　defect　traps,　along　with　the　oxygen　vacancies　of　the　ceramics,　contributed　to　PC　self-recovery.　Taking　advantage　of　the　difference　in　PC　self-recovery　rates　between　yellow　and　blue　emissions　with　time　and　the　difference　in　color　temperatures　(C.T.),　we　propose　a　method　of　encrypting,　calibrating,　and　performing　C.T.　detection　on　the　nodes　and　paths　of　a　single　ceramic　for　optical　signal　input.　This　study　will　guide　the　construction　of　visual-invisible　double-encryption　anti-counterfeiting　systems　based　on　other　novel　materials.　©　2025　Elsevier　Ltd