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Lab Chemicals
Adsorption Indicators
CONGO RED INDICATOR
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
Article No.
02930
Grade
For Microscopy
Purity
CAS No.
573-58-0
Molecular Formula
C
3
2
H
2
2
N
6
Na
2
O
6
S
2
Molecular Weight
696.65
H.S. Code
3204.1421
Shelf Life
60 Months
MSDS
DE
EN
FR
KO
PT
ES
TH
TR
Certificate of Analysis (COAs)
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
Packings
25 g
(00025)
100 g
(00100)
1000 g
(01000)
Specifications
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 drying (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
Revision Date :
28-Sep-2016