Widely used as a fluorescent tracer in environmental studies to track water flow and detect leaks in complex systems. Commonly applied in hydrology to study movement of groundwater and surface water due to its strong visibility under UV light. Used in biological staining to visualize cell structures under fluorescence microscopy, particularly in qualitative assays. Employed in the development and calibration of fluorescence-based instruments because of its consistent and intense emission. Also utilized in dye-sensitized solar cells and as a colorant in some industrial processes, though restricted in many consumer products due to toxicity concerns.