Eriochrome Black

24th October 2018



An image showing Eriochrome Black in a 100g container

Buy Eriochrome Black T Online from Leading UK Suppliers

Eriochrome Black T indicator is available in 100g containers in our online shop, where you can also get discounts on bulk orders. ReAgent also offers a range of options to suit the needs of your business, from bulk quantities to custom packing and custom labelling.

With over 40 years of industry experience, we have built an enviable reputation for high-quality products and leading customer service. All of our products are backed by a 100% quality guarantee, and we are accredited to a range of ISO standards so that you can buy with confidence. Simply contact us for more information or for free technical advice.

About Eriochrome Black T Indicator

Eriochrome Black T is an indicator used in many titration reactions. More specifically, it’s a complexometric indicator which means it undergoes a colour change in the presence of specific metal ions. In this case, Eriochrome Black T is able to detect calcium, aluminium and magnesium by turning from a blue/black protonated form to a red complexed form.

Chemical Properties

  • Common name: Eriochrome Black T
  • Other names: Mordant Black, Solochrome Black, Chromazine Black
  • Systematic name: Sodium 1-[(1-Hydroxynaphthalen-2-yl-hydrazinylidene]-6-nitro-2-naphthol-4-sulfonate
  • Molecular formula: C20H12N3O7SNa
  • Molar mass: 461.3 g/mol
  • Appearance: Black powder
  • Stability: Incompatible with strong oxidising and reducing agents
  • Uses: indicator in titrations

Environmental and Health Concerns

It is important to emphasise that this compound is classed as toxic to aquatic organisms, with the potential to cause long-term damage. As such, it is essential to follow local regulations during the disposal of waste.

In addition, Eriochrome Black T is also considered an irritant to the eyes and throat and is also slightly irritating on skin contact. Affected areas should be washed with copious amounts of water and protective clothing must be worn at all times.

24 Hour Delivery

We pride ourselves of a fast delivery service and aim to have your order on the way to you within 24 hours after purchase. All our products come with 100% quality guarantee, supported by free technical advice by a friendly member of our customer service team. Contact us today for more information on how we can help your business.


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