Tan evenly all powder, soluble in water. The strong sulfuric acid for yellow, diluted light yellow solution; In nitric acid was damaged in, a small residual yellow; In strong hydrochloric acid in the same light, diluted light yellow; In the thick of sodium hydroxide solution for yellow, diluted light yellow. Its water solution for light yellow. Structure and the C.I.Acid Yellow 151 the same.
Acid Yellow 128's appearance is a yellow-brown uniform powder, soluble in water. It is yellow in concentrated sulfuric acid, and is light yellow solution after dilution; the color light is unchanged in concentrated hydrochloric acid, it is light yellow after dilution; it is destroyed in concentrated nitric acid, and a small amount of yellow remains. It is yellow in concentrated sodium hydroxide solution and pale yellow after dilution. The aqueous dye solution is light yellow.
TRADE NAME:Lerui Acid Yellow GLG,Acid Yellow M-GL
Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
ISO | Wool | 4-5 | 4-5 | 4-5 | 4-5 | |
Leveling(grade) | Transferability | Whitening | Solubility(g/L) | Metal ion effect(grade) | ||
copper | iron | chromium | ||||
4 | C | excellent | 40(90℃) | 3 | 4 | 4~5 |
Testing method | fiber | alkali resistant | Carbonization | Chlorination discoloration | Oxygen bleaching discoloration | Alkaline fluff | Acid fluff | Boiling wool | soaping | perspiration | light fastness | ||||
discoloration | stain | discoloration | stain | discoloration | stain | discoloration | stain | ||||||||
ISO | wool | 5 | 5 | 4 | 4~5 | 4 | 4~5 | 4~5 | 4 | 2 | 2 | 4~5 | 4~5 | 4~5 | 7 |
Used for wool, silk, polyamide.
5. Blending of blended fabrics: When dyeing wool with various fibers in the same bath, the apparent color of nylon is darker and redder than wool, silk is slightly shallow, cotton and viscose fiber are not stained. Wool or silk is blended with cotton or viscose The interwoven fabric can be dyed in the same bath with a neutral bath and a direct dye, and then treated with a fixing agent to improve the wet processing fastness.
Acid Yellow 128 is optimized for protein fibers such as wool and silk, and also performs well on polyamide (nylon). It provides the best color yield and leveling on wool and silk; nylon typically requires slightly higher bath acidity for equivalent shades.
Use Acid Yellow 128 in exhaust (vat) dyeing for uniform depth, in continuous/pad processes for high throughput, or in acid printing pastes for patterned effects. Pre-dispersed liquid grades improve reproducibility in pad and jet systems.
Pre-dissolve the required dye charge in a portion of warm water and filter if necessary before introducing to the main bath. For pad/print applications, use a stable pre-dispersion and add leveling auxiliaries recommended for the fiber type to reduce surface migration and speck formation.
Acid Yellow 128 typically shows good wet-fastness (wash and perspiration) on protein fibers when properly fixed under recommended acidic conditions. Lightfastness is moderate and should be tested against end-use requirements (indoor textile goods usually acceptable; outdoor exposure may require additional UV-resistant finishing).
Dosing depends on desired shade and fabric weight; as a starting guideline, many users begin with 0.5–2.0% owf (on-weight-of-fiber) for medium shades and adjust after lab trials. Always run a lab sample and measure reflectance to finalize production dosing.
Request a spectrophotometric target (Lab values) and keep dye lot numbers consistent. Use pre-production lab dips, measure reflectance, and keep process parameters (pH, liquor ratio, temperature profile, auxiliaries) tightly controlled; small changes in pH or salt can shift hue noticeably.
Store in a cool, dry place away from direct sunlight and strong oxidizers. Keep powders tightly sealed to avoid moisture pickup; liquid/dispersed forms should be agitated before use and stored at temperatures above freezing. Always consult the product SDS for full safety and handling details.
Comply with local wastewater treatment regulations: residual dye in effluent should be minimized via optimized dosing, improved fixation and proper effluent treatment (adsorption, coagulation, or advanced oxidation where required). Provide your supplier with regulatory or testing needs (e.g., REACH, OEKO-TEX) for documentation support.
Yes—blending with compatible acid dyes allows custom hue adjustments (e.g., adding small amounts of cooler yellow or red to shift tone). Always perform lab trials to confirm compatibility, leveling behavior and fastness after blending.
Contact your supplier’s technical sales team and request a sample lot and SDS/TDS. For production planning, ask for a certificate of analysis, typical spectral data and a recommended recipe for your specific fiber and process.
