A composition comprising at least one tracer particle and a fluid, the at least one tracer particle having a core-shell structure and having at least a reference function and a reporting function, wherein the particle comprises a core , a mesoporous shell layer and at least one diffusion resistant threshold-triggered hull encapsulating the core-shell structure, wherein the reference function, which is embedded in the core and optionally in the mesoporous shell layer , serves to recognize the particle and as stable signal relative to the variable reporting function, the reference function being a fluorescent or luminescent marker, wherein the mesoporous shell layer includes the reporting function which changes irreversibly, depending on experienced physical, chemical and/or biochemical parameter, the reporting function being a fluorescent or luminescent marker having a different excitation signal or emission signal than the reference function, wherein the hull encapsulating the core-shell structure is diffusion resistant until a specific threshold in the physical, chemical and/or biochemical parameter has been reached and which is stimuli-responsive triggered by the threshold, upon which the hull dissolves, becomes permeable or temporarily permeable, breaks or separates from the core-shell structure, inducing an irreversible change in the reporting function, wherein the core is a micro- or nanoparticle comprising at least one selected from the group consisting of silica, carbon, and polymer, and wherein the fluid is selected from the group consisting of water, aqueous solutions, oil, an oil-water mixture or emulsion, a generated or natural gas stream, a liquid-gas mixture, and vapor. wherein the particle comprises a core , a mesoporous shell layer and at least one diffusion resistant threshold-triggered hull encapsulating the core-shell structure, wherein the reference function, which is embedded in the core and optionally in the mesoporous shell layer , serves to recognize the particle and as stable signal relative to the variable reporting function, the reference function being a fluorescent or luminescent marker, wherein the mesoporous shell layer includes the reporting function which changes irreversibly, depending on experienced physical, chemical and/or biochemical parameter, the reporting function being a fluorescent or luminescent marker having a different excitation signal or emission signal than the reference function, wherein the hull encapsulating the core-shell structure is diffusion resistant until a specific threshold in the physical, chemical and/or biochemical parameter has been reached and which is stimuli-responsive triggered by the threshold, upon which the hull dissolves, becomes permeable or temporarily permeable, breaks or separates from the core-shell structure, inducing an irreversible change in the reporting function, wherein the core is a micro- or nanoparticle comprising at least one selected from the group consisting of silica, carbon, and polymer, and wherein the fluid is selected from the group consisting of water, aqueous solutions, oil, an oil-water mixture or emulsion, a generated or natural gas stream, a liquid-gas mixture, and vapor. <EOS>