Basic Yellow 2 appearance of alkaline yellow O is yellow powder, soluble in cold water, soluble in hot water and bright yellow, and boiled and decomposed. Also soluble in alcohol is yellow. The dye powder is colorless in concentrated sulfuric acid and turns pale yellow after dilution; it is orange in concentrated nitric acid. The aqueous solution is added with hydrochloric acid to become dark yellow, and heated to boiling to be colorless; the sodium hydroxide dyeing solution has a white precipitate. Dyed on silk fiber, it is bright yellow, and it is red under tungsten light.
The dissolution temperature of alkaline yellow O should not exceed 60 ° C to avoid decomposition of the dye and reduce the amount of color. The dyeing temperature is preferably not more than 60 °C. When used in combination with other dyes, the temperature of the dye solution should also be controlled to not exceed 70 °C. Sometimes used to adjust the color of light, to take into account the amount of color of the main dye, also dyed at the boiling point. After the dyeing is exposed to sunlight, the shade is greenish. For example, when adding C-I.Basic Violet 14 and C.I. Basic Green 4 to black, add an appropriate amount of alkaline yellow O to improve the light fastness of black.
TRADE NAME:Basic Auramine O,Auramine Yellow
Light Fastness | 1 |
Perspiration Fastness(fading) | 2 |
Perspiration Fastness(stain) | 1 |
Soaping(fading) | 3 |
Soaping(stain) | 3-4 |
K Value | f Value | Solubilityg/L) | Other fiber stains(grade) | Dyeing PH value | Application classification | ||||||
— | — | — | cotton | viscose | nylon | Polyester | wool | ||||
— | — | — | — | — | — | — | — | — | — | 4~5.5 | basic dye |
fiber | item | Sun exposure | Flooding | soaping(40℃) | Perspiration | Rubbing | Ironing | Sulfuric acid resistance | Acetate resistant | Alkali resistance | |
dye | wet | ||||||||||
silk | sample change | 1~2 | 4 | 3 | 3~4 | — | — | 4~5 | 2~3 | 4 | 1~2 |
White silk stained | — | 1~2 | 2 | 1~2 | — | — | — | — | — | — | |
White cotton stain | — | 3~4 | 4~5 | 3~4 | 4~5 | 4~5 | 5 | — | — | — | |
Basic Yellow 2 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.
It shows strongest uptake on protein fibers (wool, silk) and on some acrylics engineered for cationic dyes; polyester requires special carriers or different dye classes.
Use appropriate mordants/fixatives, post-dyeing heat setting or crosslinking agents, and choose compatible auxiliaries; test on production swatches before scale-up.
Exhaust dyeing for textiles (controlled pH and temperature) and direct incorporation for water-based inks or coatings; disperse fully and avoid sudden pH swings to prevent uneven shade.
Store in a cool, dry place away from strong acids; avoid inhalation and skin contact — use standard PPE (gloves, goggles) and follow MSDS guidelines.
Like many dyes, it can contribute to color load in effluent. Implement dyehouse effluent treatment (adsorption, coagulation, biological treatment) and follow local discharge regulations.
