Description

Alizarin is a historically significant and versatile anthraquinone dye, also known as 1,2-dihydroxyanthraquinone. Its primary commercial value lies in its strong chelating properties with metal ions, forming stable, vivid complexes known as "lakes." This product is essential for manufacturers and R&D laboratories requiring a high-purity colorant or a critical analytical reagent. Key industries that utilize Alizarin include pigments and dyes, analytical chemistry, and specialized material science applications.

Application

• Histological Staining: A classic reagent for the microscopic detection and identification of calcium deposits (von Kossa staining) in biological tissues.
• Pigment Manufacturing (Lake Formation): Used as a key starting material for producing brilliant, lightfast red and orange pigments by forming insoluble complexes (lakes) with aluminum, calcium, or other metal cations.
• Analytical Chemistry: Employed as a metallochromic indicator in complexometric titrations for determining ions like aluminum, zirconium, and thorium due to its distinct color change upon chelation.
• Textile Dyeing (Mordant Dye): Functions as a mordant dye for natural fibers like wool and silk, where it bonds with metal salts pre-applied to the fabric to create colorfast shades.
• pH Indicator: Serves as a visual pH indicator in certain ranges, changing color from yellow in acidic conditions to red/violet in alkaline conditions.
• Research & Development: Used in chemical synthesis, material science research, and as a standard reference compound in spectroscopic analysis.

Basic Information

Product Name	Alizarin
CAS No.	72-48-0
Molecular Formula	C14H8O4
Molecular Weight	240.21 g/mol
Synonyms	1,2-Dihydroxyanthraquinone; Alizarin Red; Alizarin B; Alizarin Indicator; Mordant Red 11; Turkey Red; CI 58000; 9,10-Anthracenedione, 1,2-dihydroxy-
EINECS	200-782-5

Quality Control

Our Alizarin is produced and tested under a stringent quality management system to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analysis, including identity confirmation, purity assay, and impurity profiling. A detailed Certificate of Analysis (COA) documenting the results for key parameters is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Orange-red to brownish-red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Loss on Drying	≤ 1.0%
Residue on Ignition (Sulfated Ash)	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.