Acid Green 27 Appearance is green powder. Soluble in water, the solution has no tendency to aggregate at room temperature, soluble in o-chlorophenol, slightly soluble in acetone, ethanol, pyridine, insoluble in chloroform, toluene. The dye is dark green in concentrated sulfuric acid, diluted It turns into emerald blue; it is brown in concentrated nitric acid. The aqueous solution is blue, hydrochloric acid is blue, and sodium hydroxide is blue-green.
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Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
ISO | Wool | 3-4 | 3-5 | 4-5 | 4-5 | 6 |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | Oxygen bleaching | Alkali fluff | Acid fluff | Acid fluff | Acid fluff | Perspiration | Perspiration | ||||
discolor | Staining | discolor | Staining | discolor | Staining | discolor | Staining | ||||||||
ISO | wool | 4~5 | 5 | 5 | 4~5 | 4~5 | 4~5 | 4 | 4 | 5 | 1~2 | 3~4 | 4~5 | 4~5 | 6 |
Used for silk, acrylic, tannin mordant dyeing cotton dyeing, also can be used for leather, paper, hemp and glue directly printing and dyeing, the discharge printing. Can also be used in oil and fat, paint color, also can be used in the preparation of color which used in ink.
Acid Green 27 is used for the dyeing of wool and silk. It has poor leveling and extractability. It is dark when it is dyed with copper ions, and it is yellow when it encounters iron ions and chromium ions.
Acid Green 27 is optimized for protein fibers (wool, silk) and polyamide fibers (nylon). It also works on leather when applied using acid dyeing or leather finishing processes. Performance on cellulose fibers is limited unless specific carrier systems or mordants are used — always run a trial on the target substrate.
Typical dyeing for wool and nylon is conducted in an acidic bath. Common operating ranges are pH ~2.0–4.0 and temperatures from 60°C up to boiling (depending on the fiber and equipment). Acidulants such as acetic acid or sulfamic acid and levelling agents are commonly used. Exact parameters vary with machine type, fiber form and shade depth — start with lab trials and consult your process engineer.
Lightfastness for many acid greens is moderate. Improvements can be achieved by: selecting higher-quality substrates, using lightfastness boosters or optical brightener-compatible finishing systems, applying suitable after-treatments (e.g., UV absorbers or protective topcoats for finished articles), and optimizing dye concentration to avoid excessive dye aggregation. Always verify with accelerated lightfastness tests (e.g., ISO or AATCC methods).
It is commonly compatible with other acid dyes and many dye auxiliaries, but compatibility depends on shade, bath exhaustion behavior, and desired fastness. When mixing with reactive or disperse dyes for blends, careful process planning and trials are required. Perform small-scale compatibility and fastness tests before production runs.
Acid dyes are water-soluble and may remain in effluent if not fully exhausted. Optimize dyeing to maximize exhaustion, recover dye where feasible, and treat effluent in accordance with local regulations. Biological treatment, adsorption (activated carbon), and advanced oxidation are common wastewater remediation strategies — consult your EHS team for the best approach.
Handle the dye using appropriate PPE: gloves, goggles and dust mask or local exhaust for powders. Avoid inhalation and repeated skin contact. The product is typically non-flammable; store in a cool, dry, well-ventilated area. Always follow the Safety Data Sheet (SDS) for specific hazard, first aid and disposal instructions.
When formulating aqueous inks, use Acid Green 27 as the colorant in conjunction with a suitable binder/resin system and humectants. Check pigment stability, pH compatibility and substrate adhesion. Conduct print trials and drying tests and confirm that the dye remains soluble and does not migrate under storage or application conditions.
