Eriochrome black T indicator solution by Research Lab Fine Chem Industries is a high grade reagent. Also known as mordant black 11, this is a complexometric indicator. The reagent is available as a dark red-brown powder which is soluble in water. It is blue in its protonated form, and turns red in colour when it forms a complex with other metals. While it is stable under general conditions, this reagent is incompatible with strong oxidizing agents. CAS No.: 1787-61-7 Quantity Provided: 125 ml per bottle Molecular formula: C20H12N3NaO7S Molecular weight: 461.38 Eriochrome black T has a variety of applications in chemical and biological sectors. This compound finds several applications in the synthesis of various organic derivatives. This indicator is commonly used in EDTA titrations and additionally to detect the presence of rare earth metals. Eriochrome black T is additionally used in dyeing and printing of wool fabric, dyeing of silk and nylon as well as in leather dyeing. It can also be used in the determination of hardness of water. This reagent is suitable for the industrial synthesis of products and research applications.