Batch NO.:MV260605 Dye Content:98.30%(spectrophotometry) Loss on Drying:0.24% Residue on Ignition:0.08% Heavy Metal(Pb):<10ppm Arsenic:<2ppm Single Unknown Impurity:≤0.18% Total Related Impurity:≤0.42% Residual Organic Solvent:Comply with ICH Q3C limitation requirements

Methyl Violet 2B is a classic triarylmethane cationic dyestuff widely deployed in lab analytical chemistry, biological testing and industrial coloring fields rather than edible additive or licensed oral pharmaceutical raw material. As core biological staining reagent, it serves regular gram staining for microbial identification and histological slice staining in pathology labs to visualize cell and bacterial morphology under microscopic observation. It works as pH indicator ranging from yellow at pH0.15 to violet at pH3.2 for titration analysis and water quality monitoring in environmental testing laboratories. In industrial manufacture, it colors acrylic fiber, natural silk, leather and paper pulp, meanwhile acting as coloring ingredient for stationery ink and printing pigment production. High-purity grade is adopted as color reference standard for dyestuff qualitative calibration and spectrophotometer verification in raw material inspection labs. Besides, it functions as chromogenic substrate for trace heavy metal qualitative detection during industrial wastewater component analysis, supporting routine analytical testing of environmental pollutant indicators.

This dyestuff is categorized as GHS Danger grade with multiple hazardous properties including acute oral toxicity and corrosive irritation risks. Hazard statements cover H301 toxic if swallowed, H315 skin irritation, H318 serious eye damage and H335 respiratory irritation upon dust inhalation. Operators must equip nitrile gloves, full-face splash-proof goggles, dustproof lab coat and particulate respirator during powder weighing and solution preparation to avoid direct body exposure and fine dust intake. For accidental contact, contaminated skin or eyes need continuous abundant running water flushing over 15 minutes and immediate medical consultation when persistent inflammation emerges. In case of unintended oral ingestion, vomiting induction is forbidden and prompt hospital treatment is required. All residual solid residues and waste solvent containing this product belong to hazardous organic waste, which must be delivered to authorized professional disposal institutions per local environmental regulations instead of random domestic garbage dumping. Store separately from strong oxidants and corrosive acid-base substances to prevent thermal decomposition and toxic gas generation under incompatible mixing conditions.