Congo Red

Congo Red is a widely used azo dye and pH indicator essential in analytical chemistry, histology, and microbiology. Its distinctive deep red colour and reliable performance make it a staple reagent in laboratories across South Africa. Available from GLASSWORLD, your trusted supplier of laboratory chemicals and stains.

Key Applications

• pH indicator (turns blue in acidic conditions, red in alkaline)
• Histological staining for amyloid detection
• Microbiological staining and culture media
• Qualitative analysis and titration indicator
• Textile and dye research

Product Specifications

• Chemical Name: Congo Red
• Chemical Formula: C₂₂H₂₂N₆Na₂O₆S₂
• CAS Number: 573-58-0
• Appearance: Dark red to brown powder
• Grade: Laboratory / Analytical
• pH Range: 3.0 (blue) – 5.0 (red)

Order online or request a bulk quote. Fast, reliable delivery to laboratories and institutions across South Africa.