A dispersant system comprising: a plurality of vessels (302, 710); a manifold (104, 722), that outputs a mix of material received at the manifold to form a dispersant; a computer controller; a plurality of computer-controlled valves, coupled to the computer controller, wherein a corresponding valve of the plurality of computer-controlled valves is for allowing or blocking flow of material to the manifold (104, 722) from a corresponding vessel (302, 710) corresponding to the corresponding valve; and a nozzle (124, 724), coupled to the manifold (104, 722), for dispersing the dispersant; characterized in that, the plurality of vessels holds DNA taggants, wherein a vessel of the plurality of vessels holds a DNA taggant distinct from other DNA taggants held in other vessels of the plurality of vessels; the computer controller includes determining logic to determine a tag string comprising a plurality of characters and converting logic to convert the tag string into a selection of DNA taggants of a DNA taggant set, wherein the DNA taggant set comprises a plurality of distinct selected DNA taggants corresponding to the plurality of characters of the tag string and obtained at the manifold as a mix of DNA taggants from corresponding vessels of the plurality of vessels; the nozzle is configured to disperse the dispersant onto an object to be tagged with the tag string by application of the DNA taggant set in the dispersant formed according to the tag string; and the computer controller further includes selection logic to first select a first tag string and control the plurality of computer-controlled valves such that the nozzle disperses a first dispersant onto a first object wherein the first dispersant comprises a first DNA taggant set corresponding to the first tag string and then to subsequently select a second tag string distinct from the first tag string and control the plurality of computer-controlled valves such that the nozzle disperses a second dispersant onto a second object wherein the second dispersant comprises a second DNA taggant set corresponding to the second tag string. a plurality of vessels (302, 710); a manifold (104, 722), that outputs a mix of material received at the manifold to form a dispersant; a computer controller; a plurality of computer-controlled valves, coupled to the computer controller, wherein a corresponding valve of the plurality of computer-controlled valves is for allowing or blocking flow of material to the manifold (104, 722) from a corresponding vessel (302, 710) corresponding to the corresponding valve; and a nozzle (124, 724), coupled to the manifold (104, 722), for dispersing the dispersant; the plurality of vessels holds DNA taggants, wherein a vessel of the plurality of vessels holds a DNA taggant distinct from other DNA taggants held in other vessels of the plurality of vessels; the computer controller includes determining logic to determine a tag string comprising a plurality of characters and converting logic to convert the tag string into a selection of DNA taggants of a DNA taggant set, wherein the DNA taggant set comprises a plurality of distinct selected DNA taggants corresponding to the plurality of characters of the tag string and obtained at the manifold as a mix of DNA taggants from corresponding vessels of the plurality of vessels; the nozzle is configured to disperse the dispersant onto an object to be tagged with the tag string by application of the DNA taggant set in the dispersant formed according to the tag string; and the computer controller further includes selection logic to first select a first tag string and control the plurality of computer-controlled valves such that the nozzle disperses a first dispersant onto a first object wherein the first dispersant comprises a first DNA taggant set corresponding to the first tag string and then to subsequently select a second tag string distinct from the first tag string and control the plurality of computer-controlled valves such that the nozzle disperses a second dispersant onto a second object wherein the second dispersant comprises a second DNA taggant set corresponding to the second tag string.