Congo Red Indicator

Congo Red Indicator Congo Red is a versatile, anionic diazo dye used primarily as a histological stain to detect amyloid deposits (showing apple-green birefringence under polarized light) and as a pH indicator (blue at pH 3.0, red at pH 5.2). It is also applied in microbiology for cell wall staining, in industrial dyeing (cotton/cellulose), and in research for studying protein aggregation. Congo Red Indicator Key Uses and Applications Medical & Histological Diagnosis: The “gold standard” for detecting amyloidosis, where it stains amyloid proteins in tissues (liver, kidney, heart) to produce a characteristic apple-green birefringence under polarized light. pH Indicator: Used in laboratories to detect acidic changes, with a color transition from blue (pH 3.0) to red (pH 5.2). Microbiology & Cell Biology: Used to visualize cell walls in fungi and plants, and to identify Gram-negative bacteria. Biofilm Detection: Utilized in Congo Red Agar media to identify the ability of microbes to form