fluorescent marker compounds can be adjusted to provide a multitude of markers with unique fluorescence signatures application_number US 201313919110 A description the present invention will now be described for purposes of illustration and not limitation except in the operating examples or where otherwise indicated all numbers expressing quantities percentages functionalities and so forth in the specification are to be understood as being modified in all instances by the term u201c about u201d equivalent weights and molecular weights given herein in daltons da are number average equivalent weights and number average molecular weights respectively unless indicated otherwise the present invention provides a highly fluorescent compound containing the reaction product of at least one fluorophore containing reactive polymer optionally containing a polyamine unit of the formula nch 2 ch 2 n and at least one unsubstituted or substituted aryl isocyanate or an unsubstituted or substituted aliphatic or cycloaliphatic isocyanate at an isocyanate index of 100 or less wherein the highly fluorescent compound emits fluorescence in the ultraviolet uv visible or near infrared ir region the present invention further provides a process for producing a highly fluorescent compound involving reacting at least one fluorophore containing reactive polymer optionally containing a polyamine unit of the formula nch 2 ch 2 n and at least one unsubstituted or substituted aryl isocyanate or an unsubstituted or substituted aliphatic or cycloaliphatic isocyanate at an isocyanate index of 100 or less wherein the highly fluorescent compound emits fluorescence in the ultraviolet uv visible or near infrared ir region the present invention still further provides a process for.