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Wiktionary
thioflavin

n. Either of two dyes (''thioflavin S'' and ''thioflavin T'') used for histology staining and biophysical studies of protein aggregation.

Wikipedia
Thioflavin

Thioflavins are dyes used for histology staining and biophysical studies of protein aggregation. They are also used in biophysical studies of the electrophysiology of bacteria.