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Biological Dye
eriochrome black T
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Eriochrome black T

Eriochrome black T

Eriochrome black T

Eriochrome Black T is a complexometric indicator that is part of the complexometric titrations, e.g. in the water hardness determination process. It is an azo dye. Eriochrome is a trademark of Huntsman Petrochemical, LLC.[1] In its protonated form, Eriochrome Black T is blue. It turns red when it forms a complex with calcium, magnesium, or other metal ions.

Synonym: Mordant Black 11

Grade:AR Grade

Purity:99% min

CAS Number : 1787-61-7

EC Number:217-250-3

Molecular Formula:C20H12N3NaO7S

Technical Requirements:


Eriochrome black T

Appearance Black-brown Powder
Water Soluble Test Qualified
Solubility in Ethanol Qualified
Sensitivity Test Qualified
ignition residue (w/%) 20% max


When used as an indicator in an EDTA titration, the characteristic blue end-point is reached when sufficient EDTA is added and the metal ions bound to the indicator are chelated by EDTA, leaving the free indicator molecule.
Eriochrome Black T has also been used to detect the presence of rare earth metals.

Packing:25g/bottle or according to your requirement.

How to buy Eriochrome black T

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