Congo Red is an organic compound with the chemical formula C₃₂H₂₂N₆Na₂O₆S₂ and CAS Number 573-58-0. It is commonly supplied as a dark red to reddish-brown powder and is soluble in water, forming a red-coloured solution.

Congo Red is valued for its staining properties and its ability to interact with particular biological structures. Common laboratory applications include histological staining, microscopy, biochemical research, and the investigation of amyloid deposits in tissue samples. Under appropriate conditions, Congo Red staining can produce characteristic optical properties that support the examination of amyloid-associated structures.

Congo Red also exhibits pH-dependent colour changes, making it useful in selected indicator and analytical applications. Its performance depends on the solution conditions, preparation method, and intended analytical procedure.

The appropriate grade and purity should be selected according to the requirements of the intended application, particularly for histological, biochemical, and research procedures.

KSFE Malaysia supplies laboratory chemicals and scientific products for research institutions, educational facilities, and general laboratory applications.

Safety Note: Handle Congo Red in accordance with the product label and supplier's safety data sheet (SDS). Avoid inhalation of dust and contact with the eyes and skin. Use appropriate personal protective equipment and minimise dust generation during handling. Prevent the release of the dye into drains or the environment, and follow the supplier's recommended procedures for storage, handling, and disposal.