Acid Green 20 Appearance is dark green to green light black powder. Soluble in water, slightly soluble in ethanol, insoluble in other organic solvents. Purple in 10% sodium hydroxide solution; blue-green in concentrated sulfuric acid, blue after dilution Color, precipitated; brown solution in concentrated nitric acid. Its aqueous solution is dark blue green, and it turns purple after adding concentrated sodium hydroxide solution.
Acid Green 20 is Soluble in water and soluble fiber element, slightly soluble in alcohol, insoluble in other organic solvents. Dyes in 10% of sodium hydroxide solution for purple solution; The strong sulfuric acid for blue-ray green, diluted into blue, precipitation; In nitric acid solution for brown. The water solution is dark blue light green, add thick sodium hydroxide solution to purple.
TRADE NAME:Acid Dark Green B,Acid Green B,Acid Green N,Acid Green No 2,Akacid Green B,Anaracid Dark Green B,Atlacid Dark Green B,Atul Acid Dark Green B,Bemacid Green BD,Best Acid Dark Green A,Colocid Dark Green B,Concorde Acid Dark Green L-A,Concorde Leather Green LAD,ACID GREEN B,Cyanine Green AU,Daedo Acid Dark Green A
Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
AATCC | Wool | 2-3 | 2-3 | 3 | 2-3 | 3 |
ISO | Wool | 3 | 1 | 4-5 | 2 | 3-4 |
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 | 4~5 | 4 | — | 1 | 2~3 | 2~3 | — | — | — | — | 2~3 | 2~3 | 3 | 3 |
ISO | wool | 4~5 | 4~5 | 4 | 1 | 1 | 1 | 4 | 1 | 3 | 1 | 3 | 1 | 4~5 | 3~4 |
This product is suitable for the wool, silk, wool blended fabric, polyamide fiber of dyeing and printing, also suitable for leather and paper color.
Acid Green 20 performs best on protein fibers (wool, silk) and polyamide (nylon). These fibers show high dye exhaustion under acid dyeing conditions; results on cellulose fibers (cotton) are negligible unless a carrier or pre-treatment is used.
Typical dyeing conditions are pH 4.0–5.5 using acetic acid or formic acid as acidifier. Start at ambient temperature, raise to 85–95°C for exhaustion and fixation. Exact pH/temperature should be optimized for yarn vs. fabric and for desired fastness.
Typical dosing is 0.5–4.0% owf (on weight of fiber) depending on target depth (light to deep shades). For sample recipes, 1% owf gives a medium shade on wool; perform lab trials and scale up with the same liquor ratio and process profile.
Use non-ionic leveling agents to reduce streaking and cationic after-treatments or commercial fixation boosters to improve wet fastness. Oxidative or chemical post-fixation is not usually required but can be used for demanding applications.
Store in a cool, dry place away from strong oxidizers. For powder forms, keep in sealed bags; for liquids, tight containers are recommended. Use appropriate PPE (gloves, goggles) and follow local chemical safety regulations and SDS instructions.
Yes — it blends well with other acid dyes to shift hue or improve fastness. When formulating blends, match dyeing kinetics (exhaustion rates) and run small lab trials to ensure consistent shade and fastness after blending.
