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Congo Red Indicator (For Microscopy)
C.I.No.22120 Congo red is used to stain microscopic preparates, especially as a cytoplasm and erythrocyte stain. Congo Red 4B, Cosmos Red, Cotton Red B, Cotton Red C, Direct Red 28, Direct Red R, Direct Red Y

Product Code.
00844
Grade
Purity
CAS No.
573-58-0
Molecular Formula
C32H22N6Na2O6S2
Molecular Weight
696.65
H.S.Code
3204.14210
Shelf Life
60 Months

Physical Properties

Physical state at 20 °C
Solid
Colour
Brownish red powder
Odour
Odorless
pH value
8-9.5
Solubility in water [% weight]
Soluble in water

Packaging

Specification

Appearance
Brownish red powder
Appearance of solution (1.0 g/L; water)
almost clear to slightly turbid , red solution
Transition range at pH 3.0 to pH 5.2
Violet to orange red
Loss on dryig (at 110°C)
Max 5.0%
Sensitivity test
Passes test

Safety Information and Hazard Symbols

Symbol: GHS08
Signal Word: Danger
Hazardous Statement: H350-H361d
Precaution Statement: P201-P281-P308 + P313