The　visualization　of　level　3　fingerprint　features,　such　as　pore　size,　spacing,　and　distribution,　plays　a　crucial　role　in　matching　damaged　latent　fingerprints　(LFPs).　CsPbBr3　microcrystals　(MCs)　show　great　potential　for　LFP　visualization,　but　the　use　of　organic　surface　passivation　can　deteriorate　their　fluorescence　properties　and　reduce　imaging　quality.　In　this　study,　we　developed　CsPbBr3　MCs　with　a　Pb(OH)2　passivation　layer　formed　through　a　methylamine　vapor　phase　transition,　replacing　the　need　for　organic　passivators.　Thanks　to　the　hydrophobic　nature　and　hydrogen　bonding　properties　of　Pb(OH)2,　the　CsPbBr3　MCs　demonstrate　excellent　structural　and　fluorescence　properties,　while　also　anchor　effectively　to　amino　acids.　Beyond　the　pressure　deficit　mechanism,　FT-IR　analysis　and　theoretical　calculations　confirm　that　the　-COOH　groups　in　amino　acids　form　hydrogen　bonds　with　the　OH　groups　of　Pb(OH)2,　leading　to　the　absorption　of　CsPbBr3　MCs　onto　fingerprint　ridges.　This　results　in　superior　visualization　of　level　3　fingerprint　details,　offering　new　insights　into　the　development　of　surfactant-free　inorganic　materials　for　fluorescence　imaging.　©　2025　The　Royal　Society　of　Chemistry.