Eriochrome Black T CAS 1787-61-7

What is Eriochrome Black T CAS 1787-61-7?

Eriochrome Black T CAS 1787-61-7 is an organic monoazo compound formulated as a water-soluble monosodium salt. Typically supplied as a brownish-black to black solid powder, it dissolves efficiently in water to produce a distinct bordeaux red solution. It is manufactured through the precise diazotization of 4-amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid and subsequent coupling with naphthalen-1-ol. Its prominent chemical capability lies in functioning as an acid-base and complexometric indicator, forming strong, visual complexes with metal ions. Beyond its critical role in analytical chemistry, it serves as a highly reliable mordant dye for natural protein and synthetic fibers.

Specifications

Features

• Precise Complexometric Activity – Acts as a highly accurate analytical indicator, binding strongly to calcium and magnesium ions to facilitate the exact determination of total water hardness in laboratory titrations.
• Excellent Aqueous Solubility – Readily dissolves in water without aggregating, allowing for smooth integration into sterile analytical solutions and commercial liquid dye baths.
• Deep Mordant Pigmentation – Delivers a high-strength reddish-black shade on natural fibers directly from an acid bath, which can be chemically converted to a robust, deep blue-black via commercial afterchroming processes.

Applications

• Analytical & Biochemical Chemistry – Globally utilized in laboratory environments as a complexometric indicator for water hardness testing, the detection of rare earth metals, and the specific spectrophotometric analysis of pharmaceutical preparations.
• Textile Dyeing & Printing – Extensively applied in the commercial textile industry for the high-quality, color-fast dyeing and direct printing of wool, silk, nylon, and complex blended fabrics.
• Leather & Material Processing – Serves as a dependable commercial colorant for providing deep, even shading and highly durable coloration in the commercial leather manufacturing sector.

Packaging

Mikem offers flexible packaging options, including 25 kg of fiber drums for liquid products and 15–25 kg PP/PE bags for powder products, all customizable to meet your specific needs.