Used primarily as a fluorescent dye in biological research, it is widely applied to detect and study amyloid fibrils, which are protein aggregates associated with diseases like Alzheimer's. Its ability to bind selectively to beta-sheet structures in amyloid plaques makes it a valuable tool in neuroscience and pathology. Additionally, it is employed in material science to analyze the structural properties of synthetic polymers and fibers. The dye's fluorescence intensity increases upon binding, providing a quantitative measure of amyloid formation or polymer characteristics.