Widely used as a fluorescent tracer in environmental studies to track water flow and detect leaks in complex piping systems. Its bright fluorescence allows for easy detection even at very low concentrations. Commonly applied in hydrology to study groundwater movement and surface water interactions. Used in laboratory settings to visualize fluid dynamics and mixing processes. Employed in biological staining to mark cells or tissues under fluorescence microscopy. Also utilized in the development and calibration of fluorescence-based sensors and imaging equipment. Occasionally used in industrial dyes, though its application in consumer products is limited due to toxicity concerns.