A luminescent composition, with a luminescent marker and a ionizing agent exhibiting luminescence for an indicatory period once intermixed, and with luminance intensity remaining at a threshold intensity during indicatory period. Luminescence also can be exhibited responsive to responsive to excitatory light applied to the composition. The luminescent marker includes a coumarinic compound and the ionizing agent includes an ammonium base. Antimicrobial agents are included. A luminescence measuring apparatus includes a photoemitter and a photodetector responsive to an emissive light induced by photoemitter. An optical filter can be used with the photodetector. A two-phase composition dispensing apparatus includes a first phase reservoir, a second phase reservoir, a mixing nozzle, and a dispensing mechanism.