Acid Violet 7 Appearance is dark red powder. It is soluble in water and blue-red, slightly soluble in ethanol and acetone, insoluble in other organic solvents. It is blue-red in concentrated sulfuric acid and bright red after dilution; it turns orange when concentrated nitric acid is reddish solution When dyeing, it encounters copper and iron ions, and its color is slightly darker, while the latter is slightly shallower; chromium ions have little effect on it.
TRADE NAME:Acid magenta 6B,Acid Rubine 6B
CI.NO: 18055
Leveling(grade) | Displacement | Whitening | Solubility(g/L) | Metal ion effect(grade) | ||
copper | orin | chromium | ||||
1 | B | well | 50(90℃) | 3~4 | 3 | 3~4D |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | Oxygen bleaching | Alkali fluff | Acid fluff | potting | soaping | Perspiration | Sun exposure | ||||
discolor | Staining | discolor | Staining | discolor | Staining | discolor | Staining | ||||||||
AATCC | wool | 3~4 | 3 | — | 1 | 2 | 2 | — | — | — | — | 2 | 2 | 1 | 4 |
ISO | wool | 3~4 | 3 | 2 | 1 | 1 | 5 | 1 | 1 | 2 | 1 | 2 | 4 | 2~3 | 4 |
Acid Violet 7 used for coloring wool, silk, nylon and leather, paper, soap, wood, medicine and cosmetics, and can also be used for biological dyeing.
Acid Violet 7 shows strongest performance on protein fibres (wool, silk) and polyamide (nylon). It has limited direct affinity for cotton and most cellulosic fibres unless used with a mordant or after a chemical modification; for cellulose applications consider reactive or direct dyes instead.
As a practical starting point: 0.5–3.0% owf (on weight of fibre) depending on desired shade; pH 4.0–5.5 (adjust with acetic acid); temperature raised gradually to 80–95°C and held until exhaustion (30–60 min is common). These are laboratory starting points—always run small sample trials and follow your supplier’s technical data sheet.
Use good wetting and leveling auxiliaries, add dye slowly at lower temperatures, maintain gentle liquor circulation, and control pH precisely during uptake. Pre-scouring fibres and keeping the bath at uniform temperature also reduce streaking. If streaking persists, run a shorter temperature ramp and test a low concentration of a leveling agent.
Rinsing thoroughly after fixation and using mild afterbaths (e.g., dilute acetic acid rinse) can help lock the dye. For increased wet-fastness on garments, consider commercial after-fixation treatments recommended for acid dyes—consult supplier recommendations before applying finishing chemicals.
Wash and wet fastness on protein fibres are generally good when dyeing and fixation are performed correctly. Lightfastness for violet acid dyes tends to be moderate—acceptable for many indoor/apparel uses but may not be ideal for prolonged outdoor exposure. Test finished samples under intended end-use conditions.
Yes—Acid Violet 7 is commonly formulated into acid printing pastes and adjusted for continuous dyeing on polyamide and wool. Viscosity, acid level and fixation step must be optimized per process. Work with your paste and process suppliers to adjust rheology and fixation profiles.
Store in a cool, dry, well-ventilated area away from strong oxidizers and extreme heat. Keep containers tightly closed. Use appropriate PPE (gloves, goggles, dust mask for powders) during handling. Follow the material safety data sheet (MSDS) from the manufacturer for spill, first aid and disposal instructions.
Minimize dye liquor concentrations and optimize exhaustion to reduce residual dye. Use efficient rinsing and consider wastewater treatment options (enzymatic/adsorption/coagulation or advanced oxidation) suited for acid dye removal. Always comply with local discharge regulations and consult an effluent specialist for scale-up.
Common quality checks include shade matching by spectrophotometer, measurement of % exhaustion (by absorbance of bath before/after), and fastness tests (wash, rub, light). Keep records of pH, temperature profile and liquor ratio for reproducibility.
