Overview
Basic Violet 5BN is a triarylmethane dye belonging to the methyl violet family. It is synthesized through the condensation of dimethylaniline with phosgene, followed by oxidation. The dye exhibits a vibrant violet color in solution and is valued for its stability and intense coloration. Initially developed in the 19th century, Basic Violet 5BN became a cornerstone in textile dyeing and later found applications in microbiology as a staining agent. Its ability to act as a pH indicator (changing color between pH 0-2) further expands its utility in laboratory settings.
Physical and Chemical Properties
The compound appears as a dark green crystalline powder with a metallic luster. It dissolves readily in water and ethanol, producing violet solutions. The dye's color intensity is pH-dependent, transitioning from yellow (pH 0) to blue-violet (pH 1-2) and finally to green (above pH 2.5). Basic Violet 5BN has a molecular weight of 407.96 g/mol and decomposes at 137-139°C rather than melting. Its lightfastness is moderate, making it suitable for applications not exposed to prolonged sunlight. The dye forms stable complexes with tannins and mordants, enhancing its affinity for cellulose fibers in textile applications.
Main Applications
In the textile industry, Basic Violet 5BN dyes silk, wool, and modified acrylic fibers, producing rich violet hues. It's particularly effective for cotton when used with tannin mordants. The printing ink industry utilizes it for stamp pad inks and ballpoint pen formulations due to its intense color payoff. Microbiology laboratories employ Basic Violet 5BN in Gram staining procedures to differentiate bacterial cell wall types. Its pH indicator properties make it valuable in chemical analysis. Additional niche uses include paper coloring, leather dyeing, and as a component in some disinfectants where its antimicrobial properties are beneficial.
Safety and Storage
Basic Violet 5BN is classified as harmful if swallowed (H302) and causes serious eye irritation (H319). Appropriate personal protective equipment including gloves and eye protection should be worn when handling the powder. Avoid creating dust during transfer operations. The dye should be stored in tightly sealed containers in a cool, dry place away from direct sunlight. Containers must be clearly labeled with hazard information. Spills should be contained with inert absorbent materials and disposed of as hazardous waste according to local regulations. Proper ventilation is recommended in areas where the powder is handled regularly.
B2B Procurement Guide
When sourcing Basic Violet 5BN, verify the CAS number (8004-87-3) to ensure product authenticity. Industrial buyers should request certificates of analysis confirming purity (typically 85-95% for technical grade) and heavy metal content specifications. Consider ordering samples for color matching before large purchases, as batch-to-batch variations may occur. Bulk purchases (25kg drums or larger) typically offer 15-30% cost savings compared to small-quantity packaging. Establish relationships with suppliers who provide technical support for application-specific formulations. For international shipments, confirm compliance with chemical transportation regulations.
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