Acid Yellow 11

Acid Yellow 11 Appearance is yellow powder. Soluble in water, ethanol, acetone and cellosolve, soluble in ethanol, yellow, slightly soluble in benzene, insoluble in other organic solvents. Yellow in concentrated sulfuric acid, still yellow after dilution; It is also yellow after nitric acid. The aqueous solution is added with 10% sulfuric acid or sodium hydroxide. There is no change in the color of copper ions when dyeing, and the iron ions are darker.

TRADE NAME:

Acid Yellow G,Acid Brilliant Yellow 2R,Acid Yellow 2GL,Egacid Yellow G,Kanasol brilliant G,Midget brilliant yellow G

Key features

Water-soluble anionic acid dye suitable for protein (wool, silk) and polyamide fibers
Bright, vivid yellow shade with good chroma for commercial shades
Fast and even leveling in properly controlled acid dye baths
Good exhaustion at typical acid dyeing temperatures and pH ranges
Compatible with standard acid dye auxiliaries and after-treatments
Available in powder/granule forms for easy dosing and dispersion
Recommended for textile, leather, paper and some ink applications
Requires standard handling and personal protective equipment (PPE)

Practical / technical notes

Typical application: acid dyeing process using acetic acid or citric acid to set bath pH.
Recommended starting shade depth: begin testing at low concentrations and scale up; typical industrial starting range is around 0.5–1.5% o.w.f. depending on desired depth and liquor ratio.
Not suitable for untreated polyester — polyester normally requires disperse dyes or high-temperature carriers.
After-treatment (washing, soaping, or leveling agents) can improve wet-fastness and shade uniformity.

Application:

Acid Yellow 11 can directly on the wool fabric printing and dyeing leather, and can be made into color which. On paper surface shading, can also be used in paint, medicine and cosmetics of shading.

Acid Yellow 11 Use condition:

‍1. Acid Yellow 11 Mainly used for wool dyeing, it should be boiled in strong acid bath (pH of dyeing solution should be adjusted in 2~4), and can be used for direct printing of wool fabric.
2. The dyeing of silk is carried out in an acetic acid bath, and the dyeing of nylon is carried out in a formic acid dye bath.
3. Blending of blended fabrics: When the wool is dyed in the same bath as the various fibers, the silk is heavily stained, the acetate fibers are slightly stained, and the viscose fibers are not stained.
4. It can dye leather and can be used as a lake for dyeing and surface coloring on paper.
5. Can be used for coloring paints, medicines and cosmetics, as well as coatings for plastics such as polyvinyl chloride and polyethylene.

Technical Specifications

‍CAS NO: 6359-82-6
CI.NO: 18820
Molecular Formula: C16H13N4O4S.Na
Molecular Weight:380.35
Shade:Brilliant Yellow‍

Leveing(grade)	displacement	whitening	Solubility(g/L)	metal ion effect(grade)
				copper	iron	chromium
4~5	—	well	100(90℃)	2~3	3	—

Colour Fastness Test

Test Methods

fiber

Alkali resistance

Carbonization

Chlorination discoloration

Oxygen bleaching

Alkali fluff color change

Acid fluff color change

potting

soaping

Perspiration

Sun exposure

discolor

Staining

AATCC

wool

4~5

—

6~7

ISO

wool

4~5

1~2

2~3

5~6

What fibers can Acid Yellow 11 dye effectively?

Acid Yellow 11 works best on protein fibers (wool, silk) and polyamide (nylon) where acid dyeing chemistry is applicable. It binds ionically to cationic sites on these fibers when the dye bath is kept in the recommended acidic pH range. It is not effective on untreated polyester or acrylics without special pre-treatment.

How can I improve shade fastness and lightfastness for finished products?

Wet fastness often improves with proper after-soaping, use of fixing/leveling aids, and optimized dyeing conditions. Lightfastness for acid yellows can be moderate; improvement strategies include selecting darker shades or mixes with more lightfast co-dyes, and applying UV absorbers or protective topcoats in finishing if the end-use requires higher light resistance.

Is Acid Yellow 11 safe and are there regulatory limits I should know?

As with all commercial dyes, handle Acid Yellow 11 using standard industrial hygiene: gloves, eye protection, and dust control. Consult the product's Safety Data Sheet (SDS) for specific hazards, storage, and disposal instructions. Also verify compliance with regional regulations (e.g., azo-related restrictions, REACH, or local regulations) before using the dye in consumer goods.

Can Acid Yellow 11 be blended with other dyes for custom shades?

Yes — Acid Yellow 11 mixes with many acid and metal-complex acid dyes to create custom yellow, green or orange shades. Perform small scale trials to evaluate hue shift and fastness properties; when blending, consider compatibility and any effect on fastness and leveling.