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Congo red, indicator

Code: C 2465

Synonyms: Congo Red 4B, Cosmos Red, Cotton Red B, Cotton Red C, Direct Red 28, Direct Red R, Direct Red Y


for microscopy

C32H22N6Na2O6S2

32041421

696.65

Bottle / Drum
18%

for microscopy

C32H22N6Na2O6S2

32041421

696.65

Bottle / Drum

18%
PackingsPrice (INR)
25 gm 153.00
100 gm 432.00
250 gm 1107.00
1 kg 3492.00
4 x 25 kg POR
Packings
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Properties
Powder

Dye content, ≥85%

>360 °C(lit.)

22120

Description

Congo red is the sodium salt of 3,3'-([1,1'-biphenyl]-4,4'-diyl)bis(4-aminonaphthalene-1-sulfonic acid) (formula: C32H22N6Na2O6S2; molecular weight: 696.66 g/mol). It is a secondary diazo dye. Congo red is water-soluble, yielding a red colloidal solution; its solubility is better in organic solvents such as ethanol.

Application

C 2465 (OTTO) Congo red, indicator Cas 573-58-0 - used with litmus paper in a simple parlor trick: add a drop or two of Congo red to both an acid solution and a base solution.

Safety Information
  • Exclamation Mark
  • Health Hazard
Hazard Symbols

Hazard Codes T


Risk Statements 45-63
Safety Statements 53-45
WGK Germany 3

Documentation

Certificate Of Analysis

(For eg. B 1615-0108)

Other Documents

For any quries, please write to us at

qc@ottokemi.com
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PackingsPrice (INR)
25 gm 153.00
100 gm 432.00
250 gm 1107.00
1 kg 3492.00
4 x 25 kg POR