Overview
Alizarin is a historically significant red dye originally extracted from the roots of the madder plant (Rubia tinctorum). Since the late 19th century, it has been synthesized chemically, becoming one of the first natural dyes to be produced artificially. The compound belongs to the anthraquinone family and is known for its ability to form stable complexes with metal ions, particularly aluminum, which enhances its colorfastness in textile applications. In modern industry, synthetic alizarin has largely replaced the natural extract due to its consistent quality and lower production costs. While its use in textiles has declined with the advent of synthetic dyes, it remains important in specialized applications such as biological staining and as a chemical indicator.
Physical and Chemical Properties
Alizarin appears as an orange-red crystalline powder with a molecular weight of 240.21 g/mol. It has a relatively high melting point of 289-290°C and decomposes before boiling at 430°C. The compound is sparingly soluble in water but dissolves more readily in alkaline solutions and organic solvents like ethanol and ether. A key chemical characteristic of alizarin is its ability to act as a chelating agent, forming colored complexes with various metal ions. This property is particularly notable with aluminum (producing a red lake pigment), calcium (violet), and iron (brown-black). The compound also serves as a pH indicator, changing from yellow in acidic conditions to red in alkaline solutions.
Main Applications
Traditionally, alizarin's primary use was in textile dyeing, particularly for cotton and wool. When combined with metal salts (mordants), it produces various shades known as 'lakes.' The aluminum complex creates the classic Turkey red, while other metals yield different colors. This mordant dyeing technique was historically important for creating colorfast fabrics. In modern applications, alizarin serves as a biological stain in microscopy, particularly for calcium deposits in tissues. It's also used as a pH indicator in chemical analysis and finds niche applications in art pigments and specialty inks. The pharmaceutical industry utilizes certain alizarin derivatives in medicinal chemistry research.
Safety and Storage
Alizarin should be handled with basic laboratory precautions. It may cause irritation to eyes, skin, and respiratory system upon contact or inhalation. Appropriate personal protective equipment including gloves and safety glasses is recommended when handling the powder form. For storage, keep containers tightly sealed in a cool, dry, well-ventilated area away from strong oxidizers. The compound is generally stable under normal conditions but may decompose at high temperatures. Containers should be clearly labeled with appropriate hazard information according to local regulations.
B2B Procurement Guide
When sourcing alizarin for industrial applications, buyers should specify the required purity grade, which typically ranges from technical grade (90-95%) to high purity (≥98%) for sensitive applications. Key considerations include batch-to-batch consistency, especially for color-critical uses, and verification of the CAS number to ensure correct chemical identity. Suppliers should provide comprehensive technical data sheets including solubility characteristics and metal complex formation properties if relevant to the intended use. For large quantity purchases, request samples for quality verification before committing to bulk orders. Consider suppliers with experience in dye and pigment chemicals for more reliable product consistency.
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