Acid Blue 120 Appearance is dark purple uniform powder. It is soluble in water and purple. It is dark blue in ethanol. It is dark blue in concentrated sulfuric acid and greenish blue after dilution. The aqueous solution is concentrated with hydrochloric acid to form dark blue precipitate. The sodium solution is sauce red.
TRADE NAME:Acid Navy Blue GR,Atul Acid Fast Navy Blue GR,Best Acid Cyanine GR,Weak Acid Navy Blue GR,Acid Blue GR,Acid Navy Blue P-B
Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
AATCC | Wool | 3 | 3 | 3 | 4 | 5 |
ISO | Wool | 3-4 | 3-4 | 4 | 4 | |
Leveling(grade) | Displacement | Whitening | Solubility(g/L) | Metal ion effect(grade) | ||
copper | iron | chromium | ||||
2~3 | C | bad | 60(90℃) | 4 | 3 | 4 |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | Oxygen bleaching | Steaming | Alkali shrinkage | Acid shrinkage | seawater | Soaping | Perspiration | Sun exposure | ||
discolor | Staining | discolor | Staining | |||||||||||
AATCC | wool | 4~5 | 3 | — | 4 | 3 | 3 | — | 3 | — | 3 | 3 | 3 | 5 |
ISO | wool | 4~5 | 4 | 3 | 4 | 3 | 3~4 | 2 | 3~4 | — | 3~4 | 3~4 | 4 | 5 |
Mainly used for wool, polyamide fiber and fabric dyeing of silk. But with the direct dyes dyed wool/stick with blended fabric. Can also be used for leather, paper and biological shading.
Start with a laboratory-scale crocking: prepare a 1% o.w.f. sample on the target substrate using the same liquor ratio, pH and auxiliaries as planned for production. Adjust the dye concentration in 0.05–0.10% increments and record bath exhaustion curves. For shade matching, measure both wet and dry specimens with the same spectrophotometer settings and account for substrate blend effects (e.g., wool/nylon blends will shift hue toward greener or duller tones).
Acid Blue 120 typically levels well at pH 3.5–5.0. Use mild leveling agents or low-molecular weight levellers recommended for acid dyes; avoid strong cationic polymers that can lock dye immediately and create streaking. If streaking occurs, lower the initial dye rate, add a small amount of nonionic wetting agent, and extend the temperature ramp to promote even exhaustion.
Wool may show lower washfastness than polyamide unless after-treated. Recommended steps: (1) use mild acidic after-rinses to remove unfixed dye; (2) perform a mild soaping at 40–50°C with nonionic detergent; (3) consider a cationic fixing agent (follow supplier guidelines) or a gentle crosslinking post-treatment when fabric use and hand feel allow it. Always check for changes in handle or hand feel after any fixing treatment.
Yes, it can be used for acid dyeing of leather; however, leather tanning type and pre-treatments affect uptake. Conduct small-scale tests on representative leather cuts. Avoid strong oxidative after-treatments that may alter hue. Rinse thoroughly and apply leather finishing agents as required to lock in color and water resistance.
Store in a cool, dry, and well-ventilated area away from strong oxidizing agents and direct sunlight. Keep containers tightly closed. Under recommended conditions most acid dyes remain stable for at least 12–24 months; perform a quick solubility and shade check on older lots before bulk use.
Acid dyes are soluble and can contribute to colored effluent. Implement staged wastewater control: source reduction (optimize recipe to lower residual dye), primary treatment (coagulation/adsorption for color removal), and biological treatment for organic loads. For strict discharge limits, use tertiary treatment such as activated carbon or advanced oxidation. Keep records of dye input and rinse volumes for regulatory compliance.
